Question

Alex subtracted two fractions as follows. Examine his work. 5 4/7 - 3 8/9

Answer 1

1 43/63

Explanation:

5 4/7 = 5(7)+4 / 7 = 39/7

3 8/9 = 3(9)+8 / 9 = 35/9

39/7 - 35/9 = (39 · 9/7 · 9) - (35 · 7/9 · 7) = 351/63 - 245/63 = 351 - 245/63 = 106/63

106/63 = 1 43/63