Subtract 90/63 from 7/98, Solve 7/98

Subtract 90/63 from 7/98

1^st number: 7/98, 2^nd number: 1 27/63

7/98 - 90/63 is -19/14.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 63 is 882

Next, find the equivalent fraction of both fractional numbers with denominator 882
For the 1st fraction, since 98 × 9 = 882,
7/98 = 7 × 9/98 × 9 = 63/882
Likewise, for the 2nd fraction, since 63 × 14 = 882,
90/63 = 90 × 14/63 × 14 = 1260/882
Subtract the two like fractions:
63/882 - 1260/882 = 63 - 1260/882 = -1197/882
After reducing the fraction, the answer is -19/14

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