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

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

## 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 ResourcesClassroom 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.

http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1oa3

The following sheets have: