Subtract 8/21 from 8/56
8/56 - 8/21 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
8/56 = 8 × 3/56 × 3 = 24/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
8/21 = 8 × 8/21 × 8 = 64/168 - Subtract the two like fractions:
24/168 - 64/168 = 24 - 64/168 = -40/168 - After reducing the fraction, the answer is -5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/56-8/21 8/56-16/21 8/56-8/42 24/56-8/21 8/56-24/21 8/56-8/63 40/56-8/21 8/56-40/21 8/56-56/21