Subtract 30/81 from 3/28
3/28 - 30/81 is -199/756.
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,
3/28 = 3 × 81/28 × 81 = 243/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
30/81 = 30 × 28/81 × 28 = 840/2268 - Subtract the two like fractions:
243/2268 - 840/2268 = 243 - 840/2268 = -597/2268 - After reducing the fraction, the answer is -199/756
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/28-30/81 3/28-60/81 3/56-30/81 9/28-30/81 3/28-90/81 3/84-30/81 15/28-30/81 21/28-30/81