Objective: Solve add to with change unknown problems, relating varied addition and subtraction strategies.
Grade 1 Mathematics Module 2, Topic C, Lesson 23
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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.5||Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).|
|1.OA.6||Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use...|