Subtract 15/18 from 42/98, Solve 42/98

Subtract 15/18 from 42/98

42/98 - 15/18 is -17/42.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 18 is 882

Next, find the equivalent fraction of both fractional numbers with denominator 882
For the 1st fraction, since 98 × 9 = 882,
42/98 = 42 × 9/98 × 9 = 378/882
Likewise, for the 2nd fraction, since 18 × 49 = 882,
15/18 = 15 × 49/18 × 49 = 735/882
Subtract the two like fractions:
378/882 - 735/882 = 378 - 735/882 = -357/882
After reducing the fraction, the answer is -17/42

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