Subtract 8/10 from 18/21
18/21 - 8/10 is 2/35.
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,
18/21 = 18 × 10/21 × 10 = 180/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
8/10 = 8 × 21/10 × 21 = 168/210 - Subtract the two like fractions:
180/210 - 168/210 = 180 - 168/210 = 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: 36/21-8/10 18/21-16/10 18/42-8/10 18/21-8/20 54/21-8/10 18/21-24/10 18/63-8/10 18/21-8/30 90/21-8/10 18/21-40/10 18/21-8/50 18/21-56/10 18/21-8/70