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Unit 4, Lesson 29

Use and explain the totals below method using words, math drawings, and numbers

EngageNY 60 min(s)

In this lesson, students use previous knowledge of place value and expanded form to solve addition problems. They decompose two- and three-digit numbers, add like-units, and record the totals horizontally. Then students transition into the vertical form of the method when they decompose the numbers mentally, add like-units, and record the totals. The "totals below" written method give students the option of adding from left to right or from right to left. Students explain how each step of their math drawings relates to this written method.

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Other lessons from Unit 4 in Grade 2 by EngageNY

Previous Lesson

Unit 4, Lesson 28

Subtract from 200 and from numbers with zeros in the tens place

60 min(s)

Next Lesson

Unit 4, Lesson 30

Compare totals below to new groups below as written methods

60 min(s)

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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.1

Make sense of problems and persevere in solving them.

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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