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Operations and Algebraic Thinking Understand and apply properties of operations and the relationship between addition and subtraction. 3Apply properties of operations as strategies to add and subtract. 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.)
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Combining Addends
 - combining-addends worksheet  - combining-addends worksheet
Using Commutative Property
 - using-commutative-property worksheet  - using-commutative-property worksheet
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