Subtract 8/21 from 27/70
27/70 - 8/21 is 1/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
27/70 = 27 × 3/70 × 3 = 81/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
8/21 = 8 × 10/21 × 10 = 80/210 - Subtract the two like fractions:
81/210 - 80/210 = 81 - 80/210 = 1/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70-8/21 27/70-16/21 27/70-8/42 81/70-8/21 27/70-24/21 27/70-8/63 27/70-40/21 27/70-56/21