In this interactive activity, students will be led through steps to add and subtract measurements in word problems. There are teaching activities as well as practice activities available. A handout that reviews the steps taught during the interactive is available to be printed. After utilizing this resource, the students can complete the short quiz to assess their understanding.

Content Standard(s):

Mathematics MA2019 (2019) Grade: 2

20. Measure to determine how much longer one object is than another, expressing the length difference of the two objects using standard units of length.

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Evidence Of Student Attainment:

Students:

select appropriate tools for measuring.

measure lengths of two objects.

determine how much longer one object is than another.

express the length differences for the two objects using centimeters, inches, meters, or yards.

Teacher Vocabulary:

Standard units of length

Knowledge:

Students know:

strategies for comparing the length of objects.

standard units of length.

related tools.

Skills:

Students are able to:

choose and accurately use appropriate measurement tools and units of measure.

explain and justify procedures for determining the difference between the lengths of two objects.

Understanding:

Students understand that:

comparisons of objects are determined using attributes that are measurable.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.2.20.1: Measure objects using standard units.
M.2.20.2: Record lengths with appropriate units.
M.2.20.3: Use subtraction within 20 to solve problems.
M.2.20.4: Compare length using non-standard units to determine which is longer.
M.2.20.5: Use vocabulary related to comparison of length.
Examples: longer, shorter, longest, shortest, and taller.

Prior Knowledge Skills:

Define more, less, length.

Use vocabulary related to length. Examples: longer, shorter.

Identify objects by length. Examples: shortest pencil, heaviest rock.

Sort objects according to measurable attributes.

Use comparative language (longer/shorter, taller/shorter) for the attributes of objects related to length.

Communicate long, tall, short.

Recognize the length attributes of objects (long/short, tall/short).

Recognize length as the measurement of something from end to end.

Understand different forms of measurement (inches, centimeters).

Understand ruler.

Match numerals to objects or drawings.

Identify numerals 0 to 20.

Count from 0 to 20.

Add and subtract numbers within 20 using objects, pictures and fingers.

Take a smaller set out of a larger set.

Combine two sets to make a larger set up to twenty.

Count items in a set up to twenty.

Establish one-to-one correspondence between numbers and objects.

Understand one less than a number 2 through 20.

Understand one more than a number 1 through 20.

Alabama Alternate Achievement Standards

AAS Standard: M.AAS.2.19 Order three objects by length (long/longer/longest; short/shorter/shortest).

Mathematics MA2019 (2019) Grade: 2

21. Use addition and subtraction within 100 to solve word problems involving same units of length, representing the problem with drawings (such as drawings of rulers) and/or equations with a symbol for the unknown number.

Unpacked Content

Evidence Of Student Attainment:

Students:

use concrete models and/or pictures to make sense of a word problem.

write an equation with a symbol for the unknown in the problem.

explain verbally how the problem was solved.

Teacher Vocabulary:

Units of length

Drawings

Equations

Symbol

Knowledge:

Students know:

Students know strategies for solving addition and subtraction word problems involving length.

Skills:

Students are able to:

represent quantities and operations physically, pictorially, or symbolically.

strategically use a variety of representations to solve problems with all addition and subtraction contexts.

use symbols to represent unknown quantities in equations.

Understanding:

Students understand that:

that they can apply the concept of length to solve addition and subtraction word problems for numbers within 100.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.2.21.1: Solve one-step addition and subtraction word problems with an unknown by using drawings and equations with a symbol for the unknown number to represent the problem.
Examples: question mark, blank, box, or letter.
M.2.21.2: Demonstrate the understanding of terms in addition and subtraction word problems involving length.
Examples: adding to, taking from, putting together, taking apart, sum, difference, all together, how many more, how many are left, in all, inches, feet, yards, longer, shorter, nearer, farther, closer.
M.2.21.3: Locate the unknown number regardless of position.
M.2.21.4: Add and subtract within 50, e.g., by using objects or drawings to represent the problem.
M.2.21.5: Model writing equations from word problems.
M.2.21.6: Apply signs +, -, = to actions of joining and separating sets.
M.2.21.7: Identify units of measurement for length.
Examples: inches, feet, yard; centimeter, meters.

Prior Knowledge Skills:

Establish one-to-one correspondence between numbers and objects.

Point to matching or similar objects.

Add and subtract numbers within 20 using objects, pictures and fingers.

Pair "taking away" with subtraction.

Take a smaller set out of a larger set.

Pair putting together with adding.

Combine two sets to make a larger set up to twenty.

Count items in a set up to twenty.

Using counting, find one less than a number 2 through 20.

Using counting, find one more than a number 1 through 20.

Understand +, -, = and what they represent.

Define more, less, length, width, weight and height.

Use vocabulary related to length, width, weight and height.

Alabama Alternate Achievement Standards

AAS Standard: M.AAS.2.21 Increase or decrease length by adding or subtracting nonstandard unit(s).