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Unit 1, Lesson 26

Count on using the number path to find an unknown part.

EngageNY 60 min(s)

In this lesson, students continue understanding subtraction as an "unknown addend" problem, and begin relating counting on to subtraction. They use a number path to solve related addition and subtraction problems by finding one part, counting on to the total, and determining the number of counts it took to get to that total from the part. For example, they relate the number sentences 8 - 5 = ___ and 5 + ___ = 8. Then they start at 5 on the number path, count on to 8 ("Five...six, seven, eight!"), and note that it took 3 counts to get there.

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Unit 1, Lesson 25

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Unit 1, Lesson 27

Count on using the number path to find an unknown part.

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1 Content Standard is aligned with this lesson

1.OA.C.5

Major StandardsSupporting StandardsAdditional Standards

Standard 1.OA.C.5

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Part of Major Cluster 1.OA.C

Prerequisites for 1.OA.C.5

Kindergarten

Understand that each successive number name refers to a quantity that is one larger.

Upcoming Standards for 1.OA.C.5

1st Grade

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).