Standard
- CCSS.Math.Content.1.OA
- Operations and Algebraic Thinking
- CCSS.Math.Content.1.OA.B
- Understand and apply properties of operations and the relationship between addition and subtraction.
- CCSS.Math.Content.1.OA.B.3
- Apply 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.)