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Addition
Subtraction
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100

x + 4 = 13

x = 9

100

x - 15 = 21

x = 36

100

3x = 15

x = 5

100

a/8 = 3

a = 24

100

9 x 8

72

200

12 = 7 + x

5 = x

200

x - 15 = 45

x = 60

200

5k = 5

k = 1

200

4 = a/4

16 = a

200

15 x 5

75

300

k + 7 = 61

k = 54

300

30 = k - 12

42 = k

300

2m = 26

m = 13

300

k/7 = 6

k = 42

300

160 / 8

20

400

26 = m + 11

15 = m

400

m - 12 = 18

m = 30

400

8x = 72

x = 9

400

5 = m/6

30 = m

400

135 / 15

9

500

20 = a + 14 + 3

3 = a

500

35 = m - 13 - 2

50 = m

500

5k = 140

k = 28

500

x / 9 = 144

x = 16

500

What does inverse mean?

The opposite