**Title:** Mission Addition with Subtraction Action

**Description:**
This lesson uses manipulatives, acting out situations, and verbal explanations along with technology to work on addition and subtraction with kindergarten students. Students will work in groups to practice different methods of adding and subtracting.
**Standard(s): **

[MA2015] (0) 8: Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations. (Drawings need not show details, but should show the mathematics in the problem. This applies wherever drawings are mentioned in the Standards.) [K-OA1]

**Subject:**Mathematics (K)

**Title:**Mission Addition with Subtraction Action

**Description:**This lesson uses manipulatives, acting out situations, and verbal explanations along with technology to work on addition and subtraction with kindergarten students. Students will work in groups to practice different methods of adding and subtracting.

**Title:** Ice Fishing is for the Birds

**Description:**
In this lesson, students will represent addition sentences with pictorial representations. Students will also solve an addition problem by using cut out objects to represent the problem.
**Standard(s): **

[MA2015] (0) 9: Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. [K-OA2]

**Subject:**Mathematics (K)

**Title:**Ice Fishing is for the Birds

**Description:**In this lesson, students will represent addition sentences with pictorial representations. Students will also solve an addition problem by using cut out objects to represent the problem.

**Title:** Hundred Blocks Board

**Description:**
In this lesson students will practice adding, subtracting, and multiplying without regrouping using a hundred blocks board. Students will be given opportunities to identify and discuss different patterns that they discover and relate number patterns to visual patterns.
**Standard(s): **

[MA2015] (3) 9: Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. [3-OA9]

**Subject:**Mathematics (K - 3), or Technology Education (K - 2)

**Title:**Hundred Blocks Board

**Description:**In this lesson students will practice adding, subtracting, and multiplying without regrouping using a hundred blocks board. Students will be given opportunities to identify and discuss different patterns that they discover and relate number patterns to visual patterns.

**Title:** Subtraction Fun!

**Description:**
The students will be introduced to the concept of subtraction. They will use different manipulatives to practice this concept. The students will also learn to recognize the minus sign.
**Standard(s): **

[MA2015] (0) 9: Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. [K-OA2]

**Subject:**Mathematics (K)

**Title:**Subtraction Fun!

**Description:**The students will be introduced to the concept of subtraction. They will use different manipulatives to practice this concept. The students will also learn to recognize the minus sign.

**Title:** Begin with Buttons: Looking Back and Moving Forward

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students review the work of the previous lessons through a variety of activity stations, one of which involves using an interactive Web site. Students model with buttons and record addition and subtraction.
**Standard(s): **

[MA2015] (1) 5: Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). [1-OA5]

**Subject:**Mathematics

**Title:**Begin with Buttons: Looking Back and Moving Forward

**Description:**In this lesson, one of a multi-part unit from Illuminations, students review the work of the previous lessons through a variety of activity stations, one of which involves using an interactive Web site. Students model with buttons and record addition and subtraction.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Helping Ladybug Hide with Arrows and Angles

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students use a Java applet to hide a ladybug under a leaf. This requires experimentation, planning, and understanding of spatial relationships and visual memory.
**Standard(s): **

[MA2015] (1) 21: Partition circles and rectangles into two and four equal shares; describe the shares using the words *halves, fourths, and quarters*; and use the phrases *half of, fourth of, and quarter of*. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares. [1-G3]

**Subject:**Mathematics

**Title:**Helping Ladybug Hide with Arrows and Angles

**Description:**In this lesson, one of a multi-part unit from Illuminations, students use a Java applet to hide a ladybug under a leaf. This requires experimentation, planning, and understanding of spatial relationships and visual memory.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Hopping on the Number Line

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students generate sums using the '' number line'' model. This model highlights the measurement aspect of addition and is a distinctly different representation of the operation from the model presented in lesson one. The order property is also introduced. At the end of the lesson, students are encouraged to predict sums and to answer puzzles involving addition.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Mathematics

**Title:**Hopping on the Number Line

**Description:**In this lesson, one of a multi-part unit from Illuminations, students generate sums using the '' number line'' model. This model highlights the measurement aspect of addition and is a distinctly different representation of the operation from the model presented in lesson one. The order property is also introduced. At the end of the lesson, students are encouraged to predict sums and to answer puzzles involving addition.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** More and More Buttons

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students use buttons to create, model, and record addition sentences. They also explore commutativity in addition contexts.
**Standard(s): **

[MA2015] (0) 16: Classify objects into given categories; count the number of objects in each category, and sort the categories by count. (Limit category counts to be less than or equal to 10.) [K-MD3]

**Subject:**Mathematics

**Title:**More and More Buttons

**Description:**In this lesson, one of a multi-part unit from Illuminations, students use buttons to create, model, and record addition sentences. They also explore commutativity in addition contexts.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Where Will I Land?

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students find differences using the number line, a continuous model for subtraction. Students are encouraged to predict differences and to compose puzzles involving subtraction. This lesson provides rich experiences in reasoning and problem solving.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Mathematics

**Title:**Where Will I Land?

**Description:**In this lesson, one of a multi-part unit from Illuminations, students find differences using the number line, a continuous model for subtraction. Students are encouraged to predict differences and to compose puzzles involving subtraction. This lesson provides rich experiences in reasoning and problem solving.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Comparing Connecting Cubes

**Description:**
In this seven-lesson unit from Illuminations, students use connecting cubes to explore the five models of subtraction (counting, sets, number line, balanced equations, and inverse of addition). The lessons focus on the comparative mode of subtraction. Students explore the relationship between addition and subtraction, write story problems in which comparison is required, and practice the subtraction facts. Several pieces of literature appropriate for use with this lesson are suggested.
**Standard(s): **

[MA2015] (2) 1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. (See Appendix A, Table 1.) [2-OA1]

**Subject:**Mathematics

**Title:**Comparing Connecting Cubes

**Description:**In this seven-lesson unit from Illuminations, students use connecting cubes to explore the five models of subtraction (counting, sets, number line, balanced equations, and inverse of addition). The lessons focus on the comparative mode of subtraction. Students explore the relationship between addition and subtraction, write story problems in which comparison is required, and practice the subtraction facts. Several pieces of literature appropriate for use with this lesson are suggested.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Lost Buttons

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students investigate subtraction more directly, beginning with the easier take away mode. They model take away subtraction with buttons and write subtraction sentences. They also work with the additive identity (0) as an addend and as a difference and find missing addends.
**Standard(s): **

[MA2015] (2) 18: Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, e.g., by using drawings (such as drawings of rulers) and equations with a symbol for the unknown number to represent the problem. [2-MD5]

**Subject:**Language Arts,Mathematics

**Title:**Lost Buttons

**Description:**In this lesson, one of a multi-part unit from Illuminations, students investigate subtraction more directly, beginning with the easier take away mode. They model take away subtraction with buttons and write subtraction sentences. They also work with the additive identity (0) as an addend and as a difference and find missing addends.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Sum Search

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students practice addition facts in a concentration-game format using dominoes. Then, they generate sums to given numbers using a calculator and record them on a hundred board and look for patterns. Later, they record their current level of addition-fact mastery on an addition table.
**Standard(s): **

[MA2015] (1) 5: Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). [1-OA5]

**Subject:**Mathematics

**Title:**Sum Search

**Description:**In this lesson, one of a multi-part unit from Illuminations, students practice addition facts in a concentration-game format using dominoes. Then, they generate sums to given numbers using a calculator and record them on a hundred board and look for patterns. Later, they record their current level of addition-fact mastery on an addition table.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Let's Learn Those Facts: Looking Back and Moving Forward

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students display their knowledge of properties of objects for sorting and creating patterns. They also demonstrate an understanding of commutativity and model addition and subtraction of whole numbers using different representations.
**Standard(s): **

[MA2015] (2) 9: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. [2-NBT5]

**Subject:**Mathematics

**Title:**Let's Learn Those Facts: Looking Back and Moving Forward

**Description:**In this lesson, one of a multi-part unit from Illuminations, students display their knowledge of properties of objects for sorting and creating patterns. They also demonstrate an understanding of commutativity and model addition and subtraction of whole numbers using different representations.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Giant Story Problems: Reading Comprehension through Math Problem-Solving

**Description:**
Students create posters using images, text, and mathematical equations to represent a story problem.
**Standard(s): **

[ELA2015] (2) 27: Participate in shared research and writing projects (e.g., read a number of books on a single topic to produce a report; record science observations). [W.2.7]

**Subject:**Language Arts

**Title:**Giant Story Problems: Reading Comprehension through Math Problem-Solving

**Description:**Students create posters using images, text, and mathematical equations to represent a story problem.

**Thinkfinity Partner:**ReadWriteThink

**Grade Span:**1,2

**Title:** Finding the Balance

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore another model of subtraction, the balance. Students also explore recording the modeled subtraction facts and the related addition facts in equation form.
**Standard(s): **

[MA2015] (1) 7: Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. [1-OA7]

**Subject:**Mathematics

**Title:**Finding the Balance

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore another model of subtraction, the balance. Students also explore recording the modeled subtraction facts and the related addition facts in equation form.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** How Many More Fish? Looking Back and Moving Forward

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students use the mathematical knowledge and skills developed in the previous lessons as they play games involving comparative subtraction.
**Standard(s): **

[MA2015] (2) 21: Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately. [2-MD8]

**Subject:**Mathematics

**Title:**How Many More Fish? Looking Back and Moving Forward

**Description:**In this lesson, one of a multi-part unit from Illuminations, students use the mathematical knowledge and skills developed in the previous lessons as they play games involving comparative subtraction.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Try for Five

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore the many ways to decompose numbers and then build on their knowledge of addition and subtraction to find missing addends. They also visit a Web site related to the food pyramid.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Health,Mathematics

**Title:**Try for Five

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore the many ways to decompose numbers and then build on their knowledge of addition and subtraction to find missing addends. They also visit a Web site related to the food pyramid.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Shirts Full of Buttons

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore subtraction in the comparative mode by answering questions such as How many more? and How many less? as they match sets of buttons. They also make and discuss bar graphs based on the number of buttons they are wearing.
**Standard(s): **

[MA2015] (2) 23: Draw a picture graph and a bar graph (with single-unit scale) to represent a data set with up to four categories. Solve simple put-together, take-apart, and compare problems using information presented in a bar graph. (See Appendix A, Table 1.) [2-MD10]

**Subject:**Mathematics

**Title:**Shirts Full of Buttons

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore subtraction in the comparative mode by answering questions such as How many more? and How many less? as they match sets of buttons. They also make and discuss bar graphs based on the number of buttons they are wearing.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Multiple Patterns

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore patterns that involve doubling. They use objects and numbers in their exploration and record them using a table.
**Standard(s): **

[MA2015] (3) 10: Use place value understanding to round whole numbers to the nearest 10 or 100. [3-NBT1]

**Subject:**Mathematics

**Title:**Multiple Patterns

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore patterns that involve doubling. They use objects and numbers in their exploration and record them using a table.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Beverage Sharing and Serving

**Description:**
This lesson, one of a multi-part unit from Illuminations, focuses on student organization, preparation, and presentation of some simple foods as a way to apply various mathematical concepts, with problem-solving techniques being a central theme. Students work with a nonstandard unit of measurement to determine the minimum amount of fruit drink needed to serve class members and then prepare and properly serve the beverage to each student.
**Standard(s): **

[MA2015] (5) 18: Convert among different-sized standard measurement units within a given measurement system (e.g., convert 5 cm to 0.05 m), and use these conversions in solving multistep, real-world problems. [5-MD1]

**Subject:**Mathematics

**Title:**Beverage Sharing and Serving

**Description:**This lesson, one of a multi-part unit from Illuminations, focuses on student organization, preparation, and presentation of some simple foods as a way to apply various mathematical concepts, with problem-solving techniques being a central theme. Students work with a nonstandard unit of measurement to determine the minimum amount of fruit drink needed to serve class members and then prepare and properly serve the beverage to each student.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2,3,4,5

**Title:** Hopping Backward to Solve Problems

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students determine differences using the number line to compare lengths. At the end of the lesson, the students use reasoning and problem-solving to predict differences and answer puzzles involving subtraction.
**Standard(s): **

[MA2015] (1) 1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. (See Appendix A, Table 1.) [1-OA1]

**Subject:**Mathematics

**Title:**Hopping Backward to Solve Problems

**Description:**In this lesson, one of a multi-part unit from Illuminations, students determine differences using the number line to compare lengths. At the end of the lesson, the students use reasoning and problem-solving to predict differences and answer puzzles involving subtraction.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Comparing Sets

**Description:**
In this lesson, one of a multi-part unit from Illuminations, a children s book sets the stage for encouraging students to review counting back. Students write subtraction problems and model them with cubes. They then compare sets and record differences in the form of a table. The additive identity is reviewed in the context of comparing equal sets. Several pieces of literature appropriate for use with this lesson are suggested.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Language Arts,Mathematics

**Title:**Comparing Sets

**Description:**In this lesson, one of a multi-part unit from Illuminations, a children s book sets the stage for encouraging students to review counting back. Students write subtraction problems and model them with cubes. They then compare sets and record differences in the form of a table. The additive identity is reviewed in the context of comparing equal sets. Several pieces of literature appropriate for use with this lesson are suggested.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Do It With Dominoes

**Description:**
In this six-lesson unit from Illuminations, students explore the four models of addition (counting, sets, number line, and balanced equations) using dominoes. Students also learn about the order property, the relation between addition and subtraction, and the result of adding 0. Students engage in a variety of activities, including writing story problems in which the operation of addition is required, beginning to memorize addition facts, investigating properties of addition, and representing addition in pictures.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Mathematics

**Title:**Do It With Dominoes

**Description:**In this six-lesson unit from Illuminations, students explore the four models of addition (counting, sets, number line, and balanced equations) using dominoes. Students also learn about the order property, the relation between addition and subtraction, and the result of adding 0. Students engage in a variety of activities, including writing story problems in which the operation of addition is required, beginning to memorize addition facts, investigating properties of addition, and representing addition in pictures.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Taking Away Sets

**Description:**
This lesson, one of a multi-part unit from Illuminations, encourages students to explore another model for subtraction, the familiar set model. Reading one of the many books that feature subtraction sets the stage for this lesson in which the students write story problems, find differences using sets, and present results in a table. In the discussion of the table, they focus on the effects of subtracting all and subtracting 0.
**Standard(s): **

[MA2015] (1) 5: Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). [1-OA5]

**Subject:**Mathematics

**Title:**Taking Away Sets

**Description:**This lesson, one of a multi-part unit from Illuminations, encourages students to explore another model for subtraction, the familiar set model. Reading one of the many books that feature subtraction sets the stage for this lesson in which the students write story problems, find differences using sets, and present results in a table. In the discussion of the table, they focus on the effects of subtracting all and subtracting 0.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Block Pounds

**Description:**
In this lesson, from Illuminations, students explore the use of variables as unknowns as they solve for the weights of objects using information presented in pictures. They also model situations that involve the addition and subtraction of whole numbers, using objects, pictures, and symbols.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Mathematics

**Title:**Block Pounds

**Description:**In this lesson, from Illuminations, students explore the use of variables as unknowns as they solve for the weights of objects using information presented in pictures. They also model situations that involve the addition and subtraction of whole numbers, using objects, pictures, and symbols.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Building Sets of 13 and 14

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore sets of 13 and 14. They construct and identify sets of size 13 and size 14. They then compare sets to sets of size 13 and size 14, record the number in the sets, and decompose a set of 13 and a set of 14 in several ways.
**Standard(s): **

[MA2015] (2) 13: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.) [2-NBT9]

**Subject:**Mathematics

**Title:**Building Sets of 13 and 14

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore sets of 13 and 14. They construct and identify sets of size 13 and size 14. They then compare sets to sets of size 13 and size 14, record the number in the sets, and decompose a set of 13 and a set of 14 in several ways.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** How Many More Fish?

**Description:**
In this seven-lesson unit, from Illuminations, students focus on comparative subtraction. Students use fish-shaped crackers to explore all five meanings for the operations of subtraction (counting, sets, number line, balance, and inverse of addition). In these lessons, students use reasoning, represent subtraction in objects and pictures, and record subtraction in both vertical notation and equations.
**Standard(s): **

[MA2015] (1) 4: Understand subtraction as an unknown-addend problem. [1-OA4]

**Subject:**Mathematics

**Title:**How Many More Fish?

**Description:**In this seven-lesson unit, from Illuminations, students focus on comparative subtraction. Students use fish-shaped crackers to explore all five meanings for the operations of subtraction (counting, sets, number line, balance, and inverse of addition). In these lessons, students use reasoning, represent subtraction in objects and pictures, and record subtraction in both vertical notation and equations.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Counting to Find Sums

**Description:**
This lesson, one of a multi-part unit from Illuminations, focuses on the counting model for addition and begins with reading a counting book. Students model the numbers with counters as the book is read. Then they count the spots on each side of a domino and write in vertical and horizontal format the sums suggested by dominoes. Finally, the students illustrate a domino and record a sum it represents for their portfolio. Several pieces of literature appropriate for use with this lesson are suggested.
**Standard(s): **

[MA2015] (1) 6: Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). [1-OA6]

**Subject:**Mathematics

**Title:**Counting to Find Sums

**Description:**This lesson, one of a multi-part unit from Illuminations, focuses on the counting model for addition and begins with reading a counting book. Students model the numbers with counters as the book is read. Then they count the spots on each side of a domino and write in vertical and horizontal format the sums suggested by dominoes. Finally, the students illustrate a domino and record a sum it represents for their portfolio. Several pieces of literature appropriate for use with this lesson are suggested.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2

**Title:** Marble Math

**Digital Tool:**
website **Web Address URL:**
http://www.abcya.com/addition.htm **Standard(s): **

[MA2015] (0) 12: Fluently add and subtract within 5. [K-OA5]**Digital Tool Description:** Marble Math is a game on www.abcya.com that allows students to practice addition with manipulatives. Students can use the tool to practice addition. The game tracks the students progress and shows students which answers are correct and incorrect. Students can use virtual manipulatives to assist them in correctly adding a number sentence. As students progress to the next level the problems get more difficult.

**Title:**Marble Math

**Digital Tool:**website

**Digital Tool Description:**Marble Math is a game on www.abcya.com that allows students to practice addition with manipulatives. Students can use the tool to practice addition. The game tracks the students progress and shows students which answers are correct and incorrect. Students can use virtual manipulatives to assist them in correctly adding a number sentence. As students progress to the next level the problems get more difficult.

**Title:** Let's Make Ten

**Digital Tool:**
Ten Frame **Web Address URL:**
http://illuminations.nctm.org/ActivityDetail.aspx?ID=75 **Standard(s): **

[MA2015] (0) 9: Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. [K-OA2]**Digital Tool Description:** The ten frame is an interactive resource that allows students to build on their number sense while moving towards thinking about computation skills. The ten frame is used to help students to review one to one correspondence skills and begin to work on beginning addition.

**Title:**Let's Make Ten

**Digital Tool:**Ten Frame

**Digital Tool Description:**The ten frame is an interactive resource that allows students to build on their number sense while moving towards thinking about computation skills. The ten frame is used to help students to review one to one correspondence skills and begin to work on beginning addition.

**Title:** Electronic Abacus

**Description:**
This student interactive, from Illuminations, explores the use of an abacus model for representing numbers and for performing addition. Students can work through several different activities, all of which explore addition.
**Standard(s): **

[MA2015] (3) 11: Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. [3-NBT2]

**Subject:**Mathematics

**Title:**Electronic Abacus

**Description:**This student interactive, from Illuminations, explores the use of an abacus model for representing numbers and for performing addition. Students can work through several different activities, all of which explore addition.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2,3,4,5

**Title:** Five Frame

**Description:**
This student interactive from Illuminations presents four games that help students develop counting and addition skills. Each of the games uses a frame of five.
**Standard(s): **

[MA2015] (0) 12: Fluently add and subtract within 5. [K-OA5]

**Subject:**Mathematics

**Title:**Five Frame

**Description:**This student interactive from Illuminations presents four games that help students develop counting and addition skills. Each of the games uses a frame of five.

**Thinkfinity Partner:**Illuminations

**Grade Span:**K,PreK,1,2