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Grade
1
Domain
Operations and Algebraic Thinking
Cluster
Understand and apply properties of operations and the relationship between addition and subtraction.
Grade 1
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1.OA.B.3
Apply properties of operations as strategies to add and subtract.
Students need not use formal...
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1.OA.B.4
Understand subtraction as an unknown-addend problem.
For example, subtract $10 - 8$ by finding...
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