Subtract 27/70 from 4/21
4/21 - 27/70 is -41/210.
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,
27/70 = 27 × 3/70 × 3 = 81/210 - Subtract the two like fractions:
40/210 - 81/210 = 40 - 81/210 = -41/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-27/70 4/21-54/70 4/42-27/70 12/21-27/70 4/21-81/70 4/63-27/70 20/21-27/70 28/21-27/70