Subtract 8/10 from 63/42, Solve 1 21/42

Subtract 8/10 from 63/42

1^st number: 1 21/42, 2^nd number: 8/10

63/42 - 8/10 is 7/10.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
63/42 = 63 × 5/42 × 5 = 315/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
8/10 = 8 × 21/10 × 21 = 168/210
Subtract the two like fractions:
315/210 - 168/210 = 315 - 168/210 = 147/210
After reducing the fraction, the answer is 7/10

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