Subtract 50/9 from 63/42, Solve 1 21/42

Subtract 50/9 from 63/42

1^st number: 1 21/42, 2^nd number: 5 5/9

63/42 - 50/9 is -73/18.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
63/42 = 63 × 3/42 × 3 = 189/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
50/9 = 50 × 14/9 × 14 = 700/126
Subtract the two like fractions:
189/126 - 700/126 = 189 - 700/126 = -511/126
After reducing the fraction, the answer is -73/18

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