Subtract 56/70 from 4/21
4/21 - 56/70 is -64/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
4/21 = 4 × 10/21 × 10 = 40/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
56/70 = 56 × 3/70 × 3 = 168/210 - Subtract the two like fractions:
40/210 - 168/210 = 40 - 168/210 = -128/210 - After reducing the fraction, the answer is -64/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-56/70 4/42-56/70 12/21-56/70 4/63-56/70 20/21-56/70 28/21-56/70