Subtract 10/15 from 18/28, Solve 18/28

Subtract 10/15 from 18/28

18/28 - 10/15 is -1/42.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 28 × 15 = 420,
18/28 = 18 × 15/28 × 15 = 270/420
Likewise, for the 2nd fraction, since 15 × 28 = 420,
10/15 = 10 × 28/15 × 28 = 280/420
Subtract the two like fractions:
270/420 - 280/420 = 270 - 280/420 = -10/420
After reducing the fraction, the answer is -1/42

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