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Unit 2, Lesson 25

Strategize and apply understanding of the equal sign to solve equivalent expressions.

EngageNY 60 min(s)

In this lesson, students find matching expressions to create true number sentences. They work solely with equations to show and talk about how they would rerepresent a given addition or subtraction problem using an advanced strategy. For example, when given 9 + 6, students decompose the 6 into 1 and 5 and then can add using their new number sentence, 10 + 5 (i.e., 9 + 6 = 10 + 5), using pictures and words.

Related Lessons
Aligned Standards
Remediation Guidance
Teaching Strategies
Differentiation Strategies

Other lessons from Unit 2 in Grade 1 by EngageNY

Previous Lesson

Unit 2, Lesson 24

Strategize to solve take from with change unknown problems.

60 min(s)

Next Lesson

Unit 2, Lesson 26

Identify 1 ten as a unit by renaming representations of 10.

60 min(s)

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1 Content Standard is aligned with this lesson

1.OA.D.7

Major StandardsSupporting StandardsAdditional Standards

Standard 1.OA.D.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

Part of Major Cluster 1.OA.D

1 Math Practice Standard is aligned with this lesson

Standard MP.2

Reason abstractly and quantitatively.

Upcoming Standards for 1.OA.D.7

1st Grade

1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = __ - 3, 6 + 6 = __.

2nd Grade

2.OA.C.3

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

2.OA.C.4

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

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