Grade 1 Mathematics Module 2, Topic B, Lesson 20

student erasing

Objective: Subtract 7, 8, and 9 from teen numbers.

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Common Core Learning Standards

CCLS State Standard
1.OA.4 Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the...
1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use...
1.OA.7 Understand the meaning of the equal sign, and determine if equations involving addition and...

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