Subtract 8/10 from 6/21
6/21 - 8/10 is -18/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
6/21 = 6 × 10/21 × 10 = 60/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
8/10 = 8 × 21/10 × 21 = 168/210 - Subtract the two like fractions:
60/210 - 168/210 = 60 - 168/210 = -108/210 - After reducing the fraction, the answer is -18/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-8/10 6/21-16/10 6/42-8/10 6/21-8/20 18/21-8/10 6/21-24/10 6/63-8/10 6/21-8/30 30/21-8/10 6/21-40/10 6/21-8/50 42/21-8/10 6/21-56/10 6/21-8/70