Subtract 81/18 from 2/28
1st number: 2/28, 2nd number: 4 9/18
2/28 - 81/18 is -31/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
2/28 = 2 × 9/28 × 9 = 18/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
81/18 = 81 × 14/18 × 14 = 1134/252 - Subtract the two like fractions:
18/252 - 1134/252 = 18 - 1134/252 = -1116/252 - After reducing the fraction, the answer is -31/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/28-81/18 2/56-81/18 2/28-81/36 6/28-81/18 2/84-81/18 2/28-81/54 10/28-81/18 2/28-81/90 14/28-81/18