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Unit 7, Lesson 22

Represent two-digit sums and differences involving length by using the ruler as a number line

EngageNY 60 min(s)Support for English Language Learners

In this lesson, students represent two-digit sums and differences on a number line, and write a number sentence to represent the addition or subtraction situation. Students show how they solve these problems on the number line with different starting points, and they consider how two different measurement situations can result in the same total and are thus equal to each other (e.g., 25 + 11 = 15 + 15 + 6).

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Other lessons from Unit 7 in Grade 2 by EngageNY

Previous Lesson

Unit 7, Lesson 21

Identify unknown numbers on a number line diagram by using the distance between numbers...

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Next Lesson

Unit 7, Lesson 23

Collect and record measurement data in a table; answer questions and summarize the data...

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Other lessons similar to this one

Unit 1, Lesson 7

Solving Two-Step Word Problems (Part 1)

Massachusetts Department of Elementary and Secondary Education

Unit 2, Lesson 8

Solve addition and subtraction word problems using the ruler as a number line

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2 Content Standards are aligned with this lesson

2.MD.B.5
2.MD.B.6

Major StandardsSupporting StandardsAdditional Standards

Standard 2.MD.B.5

Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, e.g., by using drawings (such as drawings of rulers) and equations with a symbol for the unknown number to represent the problem.

Part of Major Cluster 2.MD.B

1 Math Practice Standard is aligned with this lesson

Attend to precision.

Prerequisites for 2.MD.B.5

2nd Grade

Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit.

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