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Unit 4, Lesson 21

Use math drawings to represent additions with up to two compositions and relate drawings to a written method

EngageNY 60 min(s)

In this lesson, students develop conceptual understanding of the algorithm when there are two compositions. Students relate their drawings to the vertical form, recording each change they make to their model on the numerical representation to build proficiency. They use place-value language to explain these changes.

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Other lessons from Unit 4 in Grade 2 by EngageNY

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Unit 4, Lesson 20

Use math drawings to represent additions with up to two compositions and relate drawing...

60 min(s)

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Unit 4, Lesson 22

Solve additions with up to four addends with totals within 200 with and without two com...

60 min(s)

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3 Content Standards are aligned with this lesson

2.NBT.B.7
2.NBT.B.8
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.3

Construct viable arguments and critique the reasoning of others.

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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