Subtract 21/98 from 7/40
7/40 - 21/98 is -11/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 98 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 40 × 49 = 1960,
7/40 = 7 × 49/40 × 49 = 343/1960 - Likewise, for the 2nd fraction, since 98 × 20 = 1960,
21/98 = 21 × 20/98 × 20 = 420/1960 - Subtract the two like fractions:
343/1960 - 420/1960 = 343 - 420/1960 = -77/1960 - After reducing the fraction, the answer is -11/280
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