Subtract 28/81 from 84/40
1st number: 2 4/40, 2nd number: 28/81
84/40 - 28/81 is 1421/810.
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,
84/40 = 84 × 81/40 × 81 = 6804/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
28/81 = 28 × 40/81 × 40 = 1120/3240 - Subtract the two like fractions:
6804/3240 - 1120/3240 = 6804 - 1120/3240 = 5684/3240 - After reducing the fraction, the answer is 1421/810
- In mixed form: 1611/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40-56/81 84/80-28/81 84/40-84/81