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1.OA.4
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Understand subtraction as an unknownaddend problem.
For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
Lesson Planning and Activity Resources
1.OAInteractive games for Operations and Algebraic Thinking
Grade 1 Unit: Operations & Algebraic Thinking
(from Georgia Department of Education)
This unit addresses KCAS 1.OA.18 and 1.MD.4.
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1oa4
Each sheet has 20 problems relating subtraction to addition.
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Understand subtraction as an unknownaddend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
Lesson Planning and Activity Resources
Grade 1 Unit: Operations & Algebraic Thinking
(from Georgia Department of Education)
This unit addresses KCAS 1.OA.18 and 1.MD.4.
Each sheet has 20 problems relating subtraction to addition.