Subtract 50/27 from 63/42, Solve 1 21/42

Subtract 50/27 from 63/42

1^st number: 1 21/42, 2^nd number: 1 23/27

63/42 - 50/27 is -19/54.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 42 × 9 = 378,
63/42 = 63 × 9/42 × 9 = 567/378
Likewise, for the 2nd fraction, since 27 × 14 = 378,
50/27 = 50 × 14/27 × 14 = 700/378
Subtract the two like fractions:
567/378 - 700/378 = 567 - 700/378 = -133/378
After reducing the fraction, the answer is -19/54

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