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Common Denominator
Multiplication
Subtraction
Addition
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100

17/4 + 16/8=?

50/8

100

8/7 x 11/7=?

88/49

100

12/7-24/21=?

12/21

100

17/6+14/18=?

51/18

100

7/6-14/18=?

7/18

200

13/4+ 37/16=?

89/16

200

17/9 x 13/9=?

221/81

200

13/9-30/27=?

9/27

200

13/8+41/32=?

93/32


200

27/23+93/92=?

201/92
300

27/3+31/9=?

112/9

300

21/12 x 20/12=?

420/144

300

7/13-17/39=?

4/39

300

9/11+38/44=?

74/44

300

31/24-111/120=?

44/120

400

17/5-19/20=?

49/20

400

29/17 x 13/13=?

377/221

400

15/16-58/64=?

2/64

400

16/14+81/71=?

161/70

400

111/89+621/534=?

1287/534

500

37/8-98/88=?

309/88

500

17/8 x 42=?

714/320

500

37/21-103/105=?

82/105

500

36/18+293/108=?

509/108

500

57/16 x 99/80=?

5643/1280