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Billy's addition
Bob's subtraction
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Martha's division
John's Homework
100

7+9=17

7+9=16

100

5-3=3

5-3=2

100

4 x 8=36

4 x 8=32

100

9 / 3 = 6

9 / 3 = 3 

100

74-8=76

74-8=66

200

43+8+50

43+8+51

200

28-9=20

28-9=19

200

7 x 9 = 62

7 x 9 = 63

200

81 / 3 = 270

81 / 3 = 27

200

282-26=56

282-26=256

300

87+6=813

97+6+ 93

300

63-9=69

63-9=54

300

11 x 5 = 50

11 x 5 = 55

300

48 / 8 = 8

48 / 8 =6


300

66 / 3 = 21.1

66 / 3 = 22

400

34+72=96

34+72=106

400

48-16=42

48-16=32

400

12 x 13 = 29

12 x 13 = 156

400

144 / 12 = 120

144 / 12 = 12 

400

420 x 8 = 3260

420 x 8 = 3360

500

158+24=172

158=182

500

371-58=323

371-58=313

500

156 x 58 = 2028

(Hint- the same mistake has been made in a previous question) 

156 x 58 = 9048

500

225 / 25 = 90

225 / 25 = 9

500

671+948 = 1519

671+948=1619