UNIT 3 Review

Round each number to the nearest 10 to make an estimate.

49 + 32 = ?

• 50 + 40 = 90

• 50 + 30 = 8

• 40 + 30 = 70

• 50 + 30 = 80

Round each number to the nearest HUNDRED to make an estimate.

734 - 96 =

• 700 - 90 = 610

• 700 - 100 = 600

• 730 - 100 = 630

Add. Use your whiteboard to solve.

269 + 27 = ?

Subtract. Use your whiteboard to solve.

52 - 24 = ?

Add. Use your whiteboard to solve.

487 + 144 = ?

Subtract. Use your whiteboard to solve.

592 - 65 = ?

Which number model matches this array?

• 4 x 4 = 9

• 3 x 3 = 6

• 3 x 3 = 9

• 4 x 3 = 12

Which array is a multiplication square?

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Which two facts are an example of the TURN AROUND rule?

• 4 x 3 and 3 x 4

• 3 x 3 and 4 x 4

• 3 x 4 and 4 x 4

• 2 x 2 and 1 x 2

Use the helper fact 5 x 4 = 20 to help you figure out:

6 x 4 = ?