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Addition
Subtraction
Multiplication
100

x + 5 = 12

x = 7

100

x - 7 = 19

x = 26

100

3x = 12

x = 4

200

g + 9 = 17 

x = 8

200

b - 24 = 31

b = 55

200

5y = 35

y = 7

300

18 + h = 29

h = 11

300

78 - h = 100

h = 178

300

3 × 12 = 2a

a = 18

400

47 + x = 103

x = 56

400

x - 44 - 10 = 91

x = 145

400

4x = 160

x = 40

500

67 + b + 81 = 371

b = 223

500

x - (20 - 12)2 = 71

x = 135

500

6 × 5 × 3 = 3x

x = 30