Subtract 20/30 from 21/98
21/98 - 20/30 is -19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 30 is 1470
Next, find the equivalent fraction of both fractional numbers with denominator 1470 - For the 1st fraction, since 98 × 15 = 1470,
21/98 = 21 × 15/98 × 15 = 315/1470 - Likewise, for the 2nd fraction, since 30 × 49 = 1470,
20/30 = 20 × 49/30 × 49 = 980/1470 - Subtract the two like fractions:
315/1470 - 980/1470 = 315 - 980/1470 = -665/1470 - After reducing the fraction, the answer is -19/42
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