Subtract 21/81 from 18/98
18/98 - 21/81 is -100/1323.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 81 is 7938
Next, find the equivalent fraction of both fractional numbers with denominator 7938 - For the 1st fraction, since 98 × 81 = 7938,
18/98 = 18 × 81/98 × 81 = 1458/7938 - Likewise, for the 2nd fraction, since 81 × 98 = 7938,
21/81 = 21 × 98/81 × 98 = 2058/7938 - Subtract the two like fractions:
1458/7938 - 2058/7938 = 1458 - 2058/7938 = -600/7938 - After reducing the fraction, the answer is -100/1323
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