Subtract 20/63 from 15/27, Solve 15/27

Subtract 20/63 from 15/27

15/27 - 20/63 is 5/21.

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

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 27 × 7 = 189,
15/27 = 15 × 7/27 × 7 = 105/189
Likewise, for the 2nd fraction, since 63 × 3 = 189,
20/63 = 20 × 3/63 × 3 = 60/189
Subtract the two like fractions:
105/189 - 60/189 = 105 - 60/189 = 45/189
After reducing the fraction, the answer is 5/21

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