Subtract 7/40 from 1/81
1/81 - 7/40 is -527/3240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 40 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 81 × 40 = 3240,
1/81 = 1 × 40/81 × 40 = 40/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
7/40 = 7 × 81/40 × 81 = 567/3240 - Subtract the two like fractions:
40/3240 - 567/3240 = 40 - 567/3240 = -527/3240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81-7/40 1/81-14/40 1/81-7/80 3/81-7/40 1/81-21/40 5/81-7/40 1/81-35/40 7/81-7/40 1/81-49/40