Subtract 30/12 from 21/98, Solve 21/98

Subtract 30/12 from 21/98

1^st number: 21/98, 2^nd number: 2 6/12

21/98 - 30/12 is -16/7.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 12 is 588

Next, find the equivalent fraction of both fractional numbers with denominator 588
For the 1st fraction, since 98 × 6 = 588,
21/98 = 21 × 6/98 × 6 = 126/588
Likewise, for the 2nd fraction, since 12 × 49 = 588,
30/12 = 30 × 49/12 × 49 = 1470/588
Subtract the two like fractions:
126/588 - 1470/588 = 126 - 1470/588 = -1344/588
After reducing the fraction, the answer is -16/7

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