Subtract 9/42 from 63/8, Solve 7 7/8

Subtract 9/42 from 63/8

1^st number: 7 7/8, 2^nd number: 9/42

63/8 - 9/42 is 429/56.

Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168
Likewise, for the 2nd fraction, since 42 × 4 = 168,
9/42 = 9 × 4/42 × 4 = 36/168
Subtract the two like fractions:
1323/168 - 36/168 = 1323 - 36/168 = 1287/168
After reducing the fraction, the answer is 429/56
In mixed form: 737/56

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