Subtract 42/81 from 81/40
1st number: 2 1/40, 2nd number: 42/81
81/40 - 42/81 is 1627/1080.
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,
81/40 = 81 × 81/40 × 81 = 6561/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
42/81 = 42 × 40/81 × 40 = 1680/3240 - Subtract the two like fractions:
6561/3240 - 1680/3240 = 6561 - 1680/3240 = 4881/3240 - After reducing the fraction, the answer is 1627/1080
- In mixed form: 1547/1080
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-84/81 81/80-42/81