Properties of Subtraction

With help, the student demonstrates partial success at 2.0 and 3.0.

I can understand subtraction as an unknown-addend problem. 

Vocabulary: fact family

I can:

• Understand subtraction as an unknown-addend problem. For example, I can find the number that makes 10 when added to 8, to solve 10 – 8.

• Apply properties of operations as strategies to add and subtract (commutative property of addition; associative property of addition).