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Unit 5, Lesson 14

Use math drawings to represent subtraction with up to two decompositions, relate drawings to the algorithm, and use addition to explain why the subtraction method works

EngageNY 60 min(s)

In this lesson, students continue to build their conceptual understanding of subtracting numbers within 1,000. They move from concrete to pictorial representations, as they use place-value disk drawings to model decompositions while simultaneously recording these changes in vertical form. This helps them to relate the pictorial representation to the standing vertical algorithm.

Related Lessons
Aligned Standards
Remediation Guidance
Teaching Strategies
Differentiation Strategies

Other lessons from Unit 5 in Grade 2 by EngageNY

Previous Lesson

Unit 5, Lesson 13

Relate manipulative representations to the subtraction algorithm, and use addition to e...

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Next Lesson

Unit 5, Lesson 15

Use math drawings to represent subtraction with up to two decompositions, relate drawin...

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2 Content Standards are aligned with this lesson

2.NBT.B.7
2.NBT.B.9

Major StandardsSupporting StandardsAdditional Standards

Standard 2.NBT.B.7

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Part of Major Cluster 2.NBT.B

1 Math Practice Standard is aligned with this lesson

Standard MP.7

Look for and make use of structure.

Prerequisites for 2.NBT.B.7

2nd Grade

2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

2.NBT.A.1.A

100 can be thought of as a bundle of ten tens - called a "hundred."

2.NBT.A.1.B

The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

Upcoming Standards for 2.NBT.B.7

2nd Grade

2.NBT.B.6

Add up to four two-digit numbers using strategies based on place value and properties of operations.

3rd Grade

3.NBT.A.2

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.

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