Subtract 6/30 from 3/21
3/21 - 6/30 is -2/35.
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,
3/21 = 3 × 10/21 × 10 = 30/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
6/30 = 6 × 7/30 × 7 = 42/210 - Subtract the two like fractions:
30/210 - 42/210 = 30 - 42/210 = -12/210 - After reducing the fraction, the answer is -2/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-6/30 3/21-12/30 3/42-6/30 3/21-6/60 9/21-6/30 3/21-18/30 3/63-6/30 3/21-6/90 15/21-6/30 3/21-42/30