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Operations and Algebraic Thinking 1.OA
Understand and apply properties of operations and the relationship between addition and subtraction.
3.Apply properties of operations as strategies to add and subtract.3 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.)

Think Math 1.4.6, 1.4.7
*”Mouse Count” (Teaching Number Sense-1st)p. 52-60
*Coming & Going Stories” (Teaching Number Sense-1st) p. 81-85 (2 days)
*”Twelve Cats and Dogs” from Investigations Building Number Sense p. 38
Think Math 1.9.5, 1.9.6, 1.9.7, 1.9.8

List of resources;
http://www.k-5mathteachingresources.com/1st-grade-number-activities.html