Subtract 90/81 from 10/28
1st number: 10/28, 2nd number: 1 9/81
10/28 - 90/81 is -95/126.
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,
10/28 = 10 × 81/28 × 81 = 810/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
90/81 = 90 × 28/81 × 28 = 2520/2268 - Subtract the two like fractions:
810/2268 - 2520/2268 = 810 - 2520/2268 = -1710/2268 - After reducing the fraction, the answer is -95/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28-90/81 10/56-90/81 30/28-90/81 10/84-90/81 50/28-90/81 70/28-90/81