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10.4 1/5 × 2 1/7 = 21/5 × 15/7= 9/1 = c. 9

11. 2 2/3 ×2 2/5×3/8 = 8/3 ×12/5×3/8= 12/5= b. 2 2/5

12. 18: 1 4/5 = 18/1 × 5/9= 10/1 = d.10

13.3/10:3/5= 3/10×5/3 = a. 1/2


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