Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

Lesson Planning and Activity Resources

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1.OA--Interactive games for Operations and Algebraic Thinking

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Classroom examples and accompanying videos illustrate
Math Practice3 and with a focus on Content standard 1.OA.3.
Grade 1 Unit: Operations & Algebraic Thinking
(from Georgia Department of Education)
This unit addresses KCAS 1.OA.1-8 and 1.MD.4.
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The following sheets have:
  • problems filling in a blank for addition problems using the commutative property.
  • problems filling in a blank to make an equal problem.