Subtract 7/90 from 42/98, Solve 42/98

Subtract 7/90 from 42/98

42/98 - 7/90 is 221/630.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 90 is 4410

Next, find the equivalent fraction of both fractional numbers with denominator 4410
For the 1st fraction, since 98 × 45 = 4410,
42/98 = 42 × 45/98 × 45 = 1890/4410
Likewise, for the 2nd fraction, since 90 × 49 = 4410,
7/90 = 7 × 49/90 × 49 = 343/4410
Subtract the two like fractions:
1890/4410 - 343/4410 = 1890 - 343/4410 = 1547/4410
After reducing the fraction, the answer is 221/630

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