Subtract 40/9 from 81/28
1st number: 2 25/28, 2nd number: 4 4/9
81/28 - 40/9 is -391/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
81/28 = 81 × 9/28 × 9 = 729/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
40/9 = 40 × 28/9 × 28 = 1120/252 - Subtract the two like fractions:
729/252 - 1120/252 = 729 - 1120/252 = -391/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/28-80/9 81/56-40/9 81/28-40/18 81/84-40/9 81/28-40/27 81/28-40/45 81/28-40/63