Subtract 3/81 from 1/40
1/40 - 3/81 is -13/1080.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 81 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 40 × 81 = 3240,
1/40 = 1 × 81/40 × 81 = 81/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
3/81 = 3 × 40/81 × 40 = 120/3240 - Subtract the two like fractions:
81/3240 - 120/3240 = 81 - 120/3240 = -39/3240 - After reducing the fraction, the answer is -13/1080
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/40-3/81 1/40-6/81 1/80-3/81 3/40-3/81 1/40-9/81 5/40-3/81 1/40-15/81 7/40-3/81 1/40-21/81