**Title:** Where Oh Where Has My Addend Gone?

**Description:**
Students will use number bonds and counters as a strategy for finding the missing addend. Students will become aware of the relationship between addition and subtraction. They will also use counting as it is related to addition and subtraction.
This is a College- and Career-Ready Standards showcase lesson plan.
**Standard(s): **

[MA2015] (1) 8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. [1-OA8]

**Subject:**Mathematics (1)

**Title:**Where Oh Where Has My Addend Gone?

**Description:**Students will use number bonds and counters as a strategy for finding the missing addend. Students will become aware of the relationship between addition and subtraction. They will also use counting as it is related to addition and subtraction. This is a College- and Career-Ready Standards showcase lesson plan.

**Title:** Adding with the Associative Property

**Description:**
Students will learn ways to add using the associative property of addition. Students will view a PowerPoint presentation to introduce associative property of addition.
**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 (1)

**Title:**Adding with the Associative Property

**Description:**Students will learn ways to add using the associative property of addition. Students will view a PowerPoint presentation to introduce associative property of addition.

**Title:** Camp Add 'Em Up

**Description:**
When you go to camp, you expect to have a great time and learn a lot. The Camp Add 'Em Up lesson series is designed to guide a first grade student through development of addition and subtraction strategies through patterning. This lesson has the unique element of offering the learning pages in Spanish for students who are bilingual or for the teacher who would like to integrate Spanish language elements into lessons. Creative learners and technical learners have options included within each lesson as extension activities.
**Standard(s): **

[MA2015] (1) 3: Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) [1-OA3]

**Subject:**Mathematics (1)

**Title:**Camp Add 'Em Up

**Description:**When you go to camp, you expect to have a great time and learn a lot. The Camp Add 'Em Up lesson series is designed to guide a first grade student through development of addition and subtraction strategies through patterning. This lesson has the unique element of offering the learning pages in Spanish for students who are bilingual or for the teacher who would like to integrate Spanish language elements into lessons. Creative learners and technical learners have options included within each lesson as extension activities.

**Title:** You Can Add!

**Description:**
Students will learn ways to add using the associative property of addition. Students will view a PowerPoint presentation to introduce associative property of addition.
**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 (1), or Technology Education (K - 2)

**Title:**You Can Add!

**Description:**Students will learn ways to add using the associative property of addition. Students will view a PowerPoint presentation to introduce associative property of addition.

**Title:** How Many Times Did You Add That?

**Description:**
After watching the video clip of the Hershey's plant, students will use grid paper to investigate multiplication as repeated addition.
This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.
**Standard(s): **

[SS2010] LWT2 (2) 7: Explain production and distribution processes.

**Subject:**Mathematics (1 - 4), or Social Studies (2)

**Title:**How Many Times Did You Add That?

**Description:**After watching the video clip of the Hershey's plant, students will use grid paper to investigate multiplication as repeated addition. This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.

**Title:** To Push or Pull, That Is The Question?

**Description:**
In group students will learn to identify pushes and pulls. Students will learn how a push or pull will affect various items.
This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.
**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 (K - 1), or Credit Recovery Science (K - 1), or Science (K), or Technology Education (K - 2)

**Title:**To Push or Pull, That Is The Question?

**Description:**In group students will learn to identify pushes and pulls. Students will learn how a push or pull will affect various items. This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.

**Title:** We Are Family!

**Description:**
This is a fun way to incorporate fun with addition and subtraction fact families. The students will have fun matching facts and making a happy home.This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.
**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 (K - 2), or Technology Education (3 - 5)

**Title:**We Are Family!

**Description:**This is a fun way to incorporate fun with addition and subtraction fact families. The students will have fun matching facts and making a happy home.This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.

**Title:** Cracker Math (Commutative Property)

**Description:**
During this lesson students will listen to the story FISH EYES: A BOOK YOU CAN COUNT ON by Lois Ehlert and use concrete objects to explore the commutative property of addition. During this lesson students will be guided through exercises to strengthen knowledge that the order of the addends has no effect upon the sum. In mathematical terms, a+b=b+a. They will also use the internet to practice what they have learned during this lesson.
**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 (1)

**Title:**Cracker Math (Commutative Property)

**Description:**During this lesson students will listen to the story FISH EYES: A BOOK YOU CAN COUNT ON by Lois Ehlert and use concrete objects to explore the commutative property of addition. During this lesson students will be guided through exercises to strengthen knowledge that the order of the addends has no effect upon the sum. In mathematical terms, a+b=b+a. They will also use the internet to practice what they have learned during this lesson.

**Title:** Fact Families: Addition and Subtraction Skills

**Description:**
During this lesson students learn how numbers create fact families. Students identify missing numbers from a fact family by working on an Internet site. They also create their own slideshow presentation demonstrating fact families.
**Standard(s): **

[MA2015] (1) 3: Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) [1-OA3]

**Subject:**Mathematics (1 - 2), or Technology Education (3 - 5)

**Title:**Fact Families: Addition and Subtraction Skills

**Description:**During this lesson students learn how numbers create fact families. Students identify missing numbers from a fact family by working on an Internet site. They also create their own slideshow presentation demonstrating fact families.

**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:** Who's in the Fact Family?

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore the relation of addition to subtraction. Students use problem-solving skills to find fact families, including those in which one addend is zero or in which the addends are alike.
**Standard(s): **

[MA2015] (1) 8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. [1-OA8]

**Subject:**Mathematics

**Title:**Who's in the Fact Family?

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore the relation of addition to subtraction. Students use problem-solving skills to find fact families, including those in which one addend is zero or in which the addends are alike.

**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:** What Balances?

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students explore subtraction using a pan balance. They use subtraction facts to generate related addition facts and explore at the concrete level the idea of subtraction as the inverse of addition.
**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:**What Balances?

**Description:**In this lesson, one of a multi-part unit from Illuminations, students explore subtraction using a pan balance. They use subtraction facts to generate related addition facts and explore at the concrete level the idea of subtraction as the inverse of addition.

**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:** Fact Family Fun

**Description:**
In this lesson, one of a multi-part unit from Illuminations, the relation of addition to subtraction is explored with fish-shaped crackers. The students search for related addition and subtraction facts for a given number and investigate fact families when one addend or the difference is 0.
**Standard(s): **

[MA2015] (2) 2: Fluently add and subtract within 20 using mental strategies. (See standard 6, Grade 1, for a list of mental strategies.) By end of Grade 2, know from memory all sums of two one-digit numbers. [2-OA2]

**Subject:**Mathematics

**Title:**Fact Family Fun

**Description:**In this lesson, one of a multi-part unit from Illuminations, the relation of addition to subtraction is explored with fish-shaped crackers. The students search for related addition and subtraction facts for a given number and investigate fact families when one addend or the difference is 0.

**Thinkfinity Partner:**Illuminations

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

**Title:** How Many More?

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students write subtraction problems, model them with sets of fish-shaped crackers, and communicate their findings in words and pictures. They record differences in words and symbols. 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] (1) 8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. [1-OA8]

**Subject:**Mathematics

**Title:**How Many More?

**Description:**In this lesson, one of a multi-part unit from Illuminations, students write subtraction problems, model them with sets of fish-shaped crackers, and communicate their findings in words and pictures. They record differences in words and symbols. 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:** Finding Fact Families

**Description:**
In this lesson, one of a multi-part unit from Illuminations, the relationship of subtraction to addition is introduced with a book and with dominoes. Then, the children explore the concept of missing addends. They also add cards with sums of 4 to their individual set of triangle-shaped flash cards. Several pieces of literature appropriate for use with this lesson are suggested.
**Standard(s): **

[MA2015] (1) 8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. [1-OA8]

**Subject:**Mathematics

**Title:**Finding Fact Families

**Description:**In this lesson, one of a multi-part unit from Illuminations, the relationship of subtraction to addition is introduced with a book and with dominoes. Then, the children explore the concept of missing addends. They also add cards with sums of 4 to their individual set of triangle-shaped flash cards. Several pieces of literature appropriate for use with this lesson are suggested.

**Thinkfinity Partner:**Illuminations

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

**Title:** Some Special Sums

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students practice doubles and doubles-plus-one addition facts. They record their current level of mastery of the addition facts on their personal addition chart.
**Standard(s): **

[MA2015] (1) 8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. [1-OA8]

**Subject:**Mathematics

**Title:**Some Special Sums

**Description:**In this lesson, one of a multi-part unit from Illuminations, students practice doubles and doubles-plus-one addition facts. They record their current level of mastery of the addition facts on their personal addition chart.

**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:** Links Away: Looking Back and Moving Forward

**Description:**
This lesson, one of a multi-part unit from Illuminations, reviews the work of the previous lessons and suggests a framework for summative assessment. Students review the models for subtraction, use the properties of subtraction, and memorize subtraction facts. During this lesson, students use the mathematical knowledge and skills developed in the previous lessons to demonstrate understanding and ability to apply that knowledge to playing a new game.
**Standard(s): **

[MA2015] (2) 2: Fluently add and subtract within 20 using mental strategies. (See standard 6, Grade 1, for a list of mental strategies.) By end of Grade 2, know from memory all sums of two one-digit numbers. [2-OA2]

**Subject:**Mathematics

**Title:**Links Away: Looking Back and Moving Forward

**Description:**This lesson, one of a multi-part unit from Illuminations, reviews the work of the previous lessons and suggests a framework for summative assessment. Students review the models for subtraction, use the properties of subtraction, and memorize subtraction facts. During this lesson, students use the mathematical knowledge and skills developed in the previous lessons to demonstrate understanding and ability to apply that knowledge to playing a new game.

**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:** Looking for Calculator Patterns

**Description:**
In this lesson, one of a multi-part unit from Illuminations, students use a Web-based calculator to create and compare counting patterns using the constant function feature of the calculator. Making connections between multiple representations of counting patterns reinforces students understanding of this important idea and helps them recall these patterns as multiplication facts.
**Standard(s): **

[MA2015] (3) 5: Apply properties of operations as strategies to multiply and divide. (Students need not use formal terms for these properties.) [3-OA5]

**Subject:**Mathematics

**Title:**Looking for Calculator Patterns

**Description:**In this lesson, one of a multi-part unit from Illuminations, students use a Web-based calculator to create and compare counting patterns using the constant function feature of the calculator. Making connections between multiple representations of counting patterns reinforces students understanding of this important idea and helps them recall these patterns as multiplication facts.

**Thinkfinity Partner:**Illuminations

**Grade Span:**3,4,5