Subtract 28/56 from 5/81
5/81 - 28/56 is -71/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 56 is 4536
Next, find the equivalent fraction of both fractional numbers with denominator 4536 - For the 1st fraction, since 81 × 56 = 4536,
5/81 = 5 × 56/81 × 56 = 280/4536 - Likewise, for the 2nd fraction, since 56 × 81 = 4536,
28/56 = 28 × 81/56 × 81 = 2268/4536 - Subtract the two like fractions:
280/4536 - 2268/4536 = 280 - 2268/4536 = -1988/4536 - After reducing the fraction, the answer is -71/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81-28/56 15/81-28/56 5/81-84/56 25/81-28/56 35/81-28/56