Subtract 18/21 from 15/98, Solve 15/98

Subtract 18/21 from 15/98

15/98 - 18/21 is -69/98.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 21 is 294

Next, find the equivalent fraction of both fractional numbers with denominator 294
For the 1st fraction, since 98 × 3 = 294,
15/98 = 15 × 3/98 × 3 = 45/294
Likewise, for the 2nd fraction, since 21 × 14 = 294,
18/21 = 18 × 14/21 × 14 = 252/294
Subtract the two like fractions:
45/294 - 252/294 = 45 - 252/294 = -207/294
After reducing the fraction, the answer is -69/98

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