Subtract 63/81 from 18/49
18/49 - 63/81 is -181/441.
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,
18/49 = 18 × 81/49 × 81 = 1458/3969 - Likewise, for the 2nd fraction, since 81 × 49 = 3969,
63/81 = 63 × 49/81 × 49 = 3087/3969 - Subtract the two like fractions:
1458/3969 - 3087/3969 = 1458 - 3087/3969 = -1629/3969 - After reducing the fraction, the answer is -181/441
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/49-63/81 18/98-63/81 54/49-63/81 90/49-63/81