Subtract 2/10 from 20/21
20/21 - 2/10 is 79/105.
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,
20/21 = 20 × 10/21 × 10 = 200/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Subtract the two like fractions:
200/210 - 42/210 = 200 - 42/210 = 158/210 - After reducing the fraction, the answer is 79/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-2/10 20/21-4/10 20/42-2/10 20/21-2/20 60/21-2/10 20/21-6/10 20/63-2/10 20/21-2/30 20/21-2/50 20/21-14/10 20/21-2/70