Subtract 3/70 from 7/21
7/21 - 3/70 is 61/210.
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,
7/21 = 7 × 10/21 × 10 = 70/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
3/70 = 3 × 3/70 × 3 = 9/210 - Subtract the two like fractions:
70/210 - 9/210 = 70 - 9/210 = 61/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-3/70 7/21-6/70 7/42-3/70 7/21-9/70 7/63-3/70 35/21-3/70 7/21-15/70 49/21-3/70 7/21-21/70