Subtract 16/81 from 21/56
21/56 - 16/81 is 115/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 81 is 4536
Next, find the equivalent fraction of both fractional numbers with denominator 4536 - For the 1st fraction, since 56 × 81 = 4536,
21/56 = 21 × 81/56 × 81 = 1701/4536 - Likewise, for the 2nd fraction, since 81 × 56 = 4536,
16/81 = 16 × 56/81 × 56 = 896/4536 - Subtract the two like fractions:
1701/4536 - 896/4536 = 1701 - 896/4536 = 805/4536 - After reducing the fraction, the answer is 115/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-16/81 21/56-32/81 63/56-16/81 21/56-48/81 21/56-80/81