Commutative Property of Addition

2+3 = 3+2

*This property states you can add two numbers in any

order!

Associative Property of Addition

(3+2)+8 = 3+(2+8)

You can change the grouping of the numbers

you add!

Identity Property of Addition

4 + 0 = 4

This property states that the sum of any number

and zero is the same number!

Sum – the answer to an addition (+) problem!

Difference – the answer to a subtraction (-)

problem!

Estimate

• To make a good guess by rounding.

Inverse Operations

• Math operations that are the opposite of each other. For example: addition and subtraction.

4+3=7 and 7-3=4

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!

Factors & Products

• 4 x 6 = 24

• 4 and 6 are factors – the numbers being multiplied together.

• 24 is the product – the answer to a multiplication problem.

Multiple

• A multiple is the product of any two whole numbers.

• For example: 3, 6, 9, 12, and 15 are multiples of 3.

• 3x1=3• 3x2=6• 3x3=9• 3x4=12• 3x5=15

Properties of Multiplication• Zero Property of Multiplication – the product

(answer) of any number times 0 is 0! 4x0=0 or 9x0=0

• Identity Property of Multiplication – the product (answer) of any number times 1 is that number! 4x1=4 or 8x1=8

• Commutative Property of Multiplication – two numbers can be multiplied in any order and the product (answer) is the same. 4x2=8 and 2x4=8.