1. Commutative Property of Addition 2+3 = 3+2 *This property states you can add two numbers in any order!

2. Associative Property of Addition (3+2)+8 = 3+(2+8) You can change the grouping of the numbers you add!

3. Identity Property of Addition 4 + 0 = 4 This property states that the sum of any number and zero is the same number!

4. Sum – the answer to an addition (+) problem! Difference – the answer to a subtraction (-) problem!

5. Estimate To make a good guess by rounding.

6. Inverse Operations Math operations that are the opposite of each other. For example: addition and subtraction. 4+3=7 and 7-3=4

7. Key Words in Word Problems In all, altogether, or combined – these words tell you to add. How many more or how much more – these words tell you to subtract!