Subtract 18/27 from 72/63, Solve 1 9/63

Subtract 18/27 from 72/63

1^st number: 1 9/63, 2^nd number: 18/27

72/63 - 18/27 is 10/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 27 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 63 × 3 = 189,
72/63 = 72 × 3/63 × 3 = 216/189
Likewise, for the 2nd fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189
Subtract the two like fractions:
216/189 - 126/189 = 216 - 126/189 = 90/189
After reducing the fraction, the answer is 10/21

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