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Unit 4, Lesson 21

Recognize and make use of part–whole relationships within tape diagrams when solving a variety of problem types.

EngageNY 60 min(s)

In this lesson, students continue solving "put together/take apart with addend unknown" and "add to with change unknown" word problems within 20. As in the previous lesson, they share their strategies for drawing when a part is unknown, and continue to work on recognizing what kind of unknown they are looking for--a part or a total.

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Other lessons from Unit 4 in Grade 1 by EngageNY

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Unit 4, Lesson 20

Recognize and make use of part–whole relationships within tape diagrams when solving a ...

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Unit 4, Lesson 22

Write word problems of varied types.

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1 Content Standard is aligned with this lesson

1.NBT.A.1

Major StandardsSupporting StandardsAdditional Standards

Standard 1.NBT.A.1

Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

Part of Major Cluster 1.NBT.A

Prerequisites for 1.NBT.A.1

Kindergarten

Count to 100 by ones and by tens.

Upcoming Standards for 1.NBT.A.1

1st Grade

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

10 can be thought of as a bundle of ten ones - called a "ten."

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).