Subtract 7/81 from 2/28
2/28 - 7/81 is -17/1134.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 28 × 81 = 2268,
2/28 = 2 × 81/28 × 81 = 162/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
7/81 = 7 × 28/81 × 28 = 196/2268 - Subtract the two like fractions:
162/2268 - 196/2268 = 162 - 196/2268 = -34/2268 - After reducing the fraction, the answer is -17/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/28-7/81 2/28-14/81 2/56-7/81 6/28-7/81 2/28-21/81 2/84-7/81 10/28-7/81 2/28-35/81 14/28-7/81 2/28-49/81