Subtract 56/18 from 84/63, Solve 1 21/63

Subtract 56/18 from 84/63

1^st number: 1 21/63, 2^nd number: 3 2/18

84/63 - 56/18 is -16/9.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 63 × 2 = 126,
84/63 = 84 × 2/63 × 2 = 168/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
56/18 = 56 × 7/18 × 7 = 392/126
Subtract the two like fractions:
168/126 - 392/126 = 168 - 392/126 = -224/126
After reducing the fraction, the answer is -16/9

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