Subtract 15/10 from 90/98, Solve 90/98

Subtract 15/10 from 90/98

1^st number: 90/98, 2^nd number: 1 5/10

90/98 - 15/10 is -57/98.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 10 is 490

Next, find the equivalent fraction of both fractional numbers with denominator 490
For the 1st fraction, since 98 × 5 = 490,
90/98 = 90 × 5/98 × 5 = 450/490
Likewise, for the 2nd fraction, since 10 × 49 = 490,
15/10 = 15 × 49/10 × 49 = 735/490
Subtract the two like fractions:
450/490 - 735/490 = 450 - 735/490 = -285/490
After reducing the fraction, the answer is -57/98

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