Objective: Subtract 7, 8, and 9 from teen numbers.
Grade 1 Mathematics Module 2, Topic B, Lesson 20
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Common Core Learning Standards
|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...|