Subtract 9/40 from 42/98, Solve 42/98

Subtract 9/40 from 42/98

42/98 - 9/40 is 57/280.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 40 is 1960

Next, find the equivalent fraction of both fractional numbers with denominator 1960
For the 1st fraction, since 98 × 20 = 1960,
42/98 = 42 × 20/98 × 20 = 840/1960
Likewise, for the 2nd fraction, since 40 × 49 = 1960,
9/40 = 9 × 49/40 × 49 = 441/1960
Subtract the two like fractions:
840/1960 - 441/1960 = 840 - 441/1960 = 399/1960
After reducing the fraction, the answer is 57/280

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