Subtract 21/16 from 42/98, Solve 42/98

Subtract 21/16 from 42/98

1^st number: 42/98, 2^nd number: 1 5/16

42/98 - 21/16 is -99/112.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 16 is 784

Next, find the equivalent fraction of both fractional numbers with denominator 784
For the 1st fraction, since 98 × 8 = 784,
42/98 = 42 × 8/98 × 8 = 336/784
Likewise, for the 2nd fraction, since 16 × 49 = 784,
21/16 = 21 × 49/16 × 49 = 1029/784
Subtract the two like fractions:
336/784 - 1029/784 = 336 - 1029/784 = -693/784
After reducing the fraction, the answer is -99/112

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