Subtract 2/10 from 8/21
8/21 - 2/10 is 19/105.
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,
8/21 = 8 × 10/21 × 10 = 80/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Subtract the two like fractions:
80/210 - 42/210 = 80 - 42/210 = 38/210 - After reducing the fraction, the answer is 19/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21-2/10 8/21-4/10 8/42-2/10 8/21-2/20 24/21-2/10 8/21-6/10 8/63-2/10 8/21-2/30 40/21-2/10 8/21-2/50 56/21-2/10 8/21-14/10 8/21-2/70