Subtract 6/30 from 7/21
7/21 - 6/30 is 2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 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 30 × 7 = 210,
6/30 = 6 × 7/30 × 7 = 42/210 - Subtract the two like fractions:
70/210 - 42/210 = 70 - 42/210 = 28/210 - After reducing the fraction, the answer is 2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-6/30 7/21-12/30 7/42-6/30 7/21-6/60 7/21-18/30 7/63-6/30 7/21-6/90 35/21-6/30 49/21-6/30 7/21-42/30