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Challenge Equations
100

a + 3 = 8

5

100

a - 5 = 4

9

100

5a = 25

5

100

a/9 = 9

81

100

156 + x = 921

765

200

x + 8 = 12

4

200

a - 10 = 13

23

200

25n = 625

25

200

a/7 = 4

28

200

4,821 = -2,922 + x

7,743

300

a + 66= 21

-45

300

a - 56 = 8

64

300

18g = 486

27

300

a/10 = 4

40

300

35x = 910

26

400

a + 30 = 120

90

400

a - 15 = 15

30

400

12y = -144

-12

400

a/12 = -4

-48

400

x/25 = 11

275

500

a + (-12) = 86

86

500

a - 48= 28

76

500

-8x = 56

-7 

500

b/-12 = -7

84

500

-13x = 702

-54