Subtract 42/21 from 7/98, Solve 7/98

Subtract 42/21 from 7/98

1^st number: 7/98, 2^nd number: 2 0/21

7/98 - 42/21 is -27/14.

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,
7/98 = 7 × 3/98 × 3 = 21/294
Likewise, for the 2nd fraction, since 21 × 14 = 294,
42/21 = 42 × 14/21 × 14 = 588/294
Subtract the two like fractions:
21/294 - 588/294 = 21 - 588/294 = -567/294
After reducing the fraction, the answer is -27/14

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