Subtract 21/81 from 84/98
84/98 - 21/81 is 113/189.
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,
84/98 = 84 × 81/98 × 81 = 6804/7938 - Likewise, for the 2nd fraction, since 81 × 98 = 7938,
21/81 = 21 × 98/81 × 98 = 2058/7938 - Subtract the two like fractions:
6804/7938 - 2058/7938 = 6804 - 2058/7938 = 4746/7938 - After reducing the fraction, the answer is 113/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/98-42/81 84/98-63/81