Subtract 21/27 from 15/60, Solve 15/60

Subtract 21/27 from 15/60

15/60 - 21/27 is -19/36.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 27 is 540

Next, find the equivalent fraction of both fractional numbers with denominator 540
For the 1st fraction, since 60 × 9 = 540,
15/60 = 15 × 9/60 × 9 = 135/540
Likewise, for the 2nd fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540
Subtract the two like fractions:
135/540 - 420/540 = 135 - 420/540 = -285/540
After reducing the fraction, the answer is -19/36

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