Subtract 49/81 from 1/8
1/8 - 49/81 is -311/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
1/8 = 1 × 81/8 × 81 = 81/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
49/81 = 49 × 8/81 × 8 = 392/648 - Subtract the two like fractions:
81/648 - 392/648 = 81 - 392/648 = -311/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8-49/81 1/8-98/81 1/16-49/81 3/8-49/81 1/24-49/81 5/8-49/81 1/40-49/81 7/8-49/81 1/56-49/81