Review What you Know Topic 3

A mental math method used to rewrite a number as the sum of numbers to form an easier problem is called

• Mental Math

• Rewriting Method

• Simplification

• Decomposition

Choosing numbers close to the numbers in a problem to make the computation easier, and then adjusting the answer is called

• Rounding

• Estimation

• Approximation

• Compensation

Multiplication and division are

• breaking apart

• inverse operations

• partial products

• compensation

6 x 2

• 24

• 12

• 42

• 8

8 x 9

• 24

• 72

• 64

• 50

6 x 5

• 24

• 35

• 25

• 30

7 x 8

• 46

• 35

• 65

• 56

4 x 8

• 32

• 22

• 42

• 24

3 x 7

• 31

• 12

• 21

• 14

Round each number to the nearest ten.

16

• 20

• 10

• 7

• 16