Subtract 21/98 from 30/40
30/40 - 21/98 is 15/28.
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,
30/40 = 30 × 49/40 × 49 = 1470/1960 - Likewise, for the 2nd fraction, since 98 × 20 = 1960,
21/98 = 21 × 20/98 × 20 = 420/1960 - Subtract the two like fractions:
1470/1960 - 420/1960 = 1470 - 420/1960 = 1050/1960 - After reducing the fraction, the answer is 15/28
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