Subtract 56/70 from 21/28
21/28 - 56/70 is -1/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
56/70 = 56 × 2/70 × 2 = 112/140 - Subtract the two like fractions:
105/140 - 112/140 = 105 - 112/140 = -7/140 - After reducing the fraction, the answer is -1/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-56/70 21/56-56/70 63/28-56/70 21/84-56/70