Subtract 21/81 from 6/49
6/49 - 21/81 is -181/1323.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 81 is 3969
Next, find the equivalent fraction of both fractional numbers with denominator 3969 - For the 1st fraction, since 49 × 81 = 3969,
6/49 = 6 × 81/49 × 81 = 486/3969 - Likewise, for the 2nd fraction, since 81 × 49 = 3969,
21/81 = 21 × 49/81 × 49 = 1029/3969 - Subtract the two like fractions:
486/3969 - 1029/3969 = 486 - 1029/3969 = -543/3969 - After reducing the fraction, the answer is -181/1323
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/49-21/81 6/49-42/81 6/98-21/81 18/49-21/81 6/49-63/81 30/49-21/81 42/49-21/81