Subtract 56/8 from 16/21
1st number: 16/21, 2nd number: 7 0/8
16/21 - 56/8 is -131/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
16/21 = 16 × 8/21 × 8 = 128/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
56/8 = 56 × 21/8 × 21 = 1176/168 - Subtract the two like fractions:
128/168 - 1176/168 = 128 - 1176/168 = -1048/168 - After reducing the fraction, the answer is -131/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-56/8 16/42-56/8 16/21-56/16 48/21-56/8 16/63-56/8 16/21-56/24 80/21-56/8 16/21-56/40