Subtract 7/10 from 4/81
4/81 - 7/10 is -527/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
4/81 = 4 × 10/81 × 10 = 40/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
7/10 = 7 × 81/10 × 81 = 567/810 - Subtract the two like fractions:
40/810 - 567/810 = 40 - 567/810 = -527/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81-7/10 4/81-14/10 4/81-7/20 12/81-7/10 4/81-21/10 4/81-7/30 20/81-7/10 4/81-35/10 4/81-7/50 28/81-7/10 4/81-49/10 4/81-7/70