Unit 5 Review

Adding

100

4 + 8

12

200

17 + (-17)

0

300

42 + (-12)

30

400

-23 + 11

-12

500

-13 + (-8)

-21

Rewriting Subtraction

100

-12 - (-3)

-12 + 3

200

-7 - (-2)

-7 + 2

300

10 - 30

10 + (-30)

400

-17 - 3

-12 + (-3)

500

23 - 40

23 + (-40)

Multiplying

100

1 x 2

2

200

3 x (-3)

-9

300

-4 x -4

16

400

-3 x -2 x -1

-6

500

12 x -2 x -2

48

Dividing

100

10 ÷ 2

5

200

15 ÷ -5

-3

300

-100 ÷ -10

10

400

32 ÷ -8

-4

500

-64 ÷ -8

8

Extra

100

Does the yellow poster in the back of the room apply to addition and subtraction?

No! ONLY multiplication and division.

200

What's the first thing you should do when you see a subtraction problem on the test?

Rewrite it as an addition problem (using the white poster)

300

How should you write "the difference between 20 and 4" as a math equation?

20 - 4

400

Find x.

2x = -40

x = -20

500

At the beginning of the week, Azurrie's bank account balance was at $422. Today, her bank account is at $391. What was the change in her account balance? 

-$31