Subtract 21/10 from 10/20
1st number: 10/20, 2nd number: 2 1/10
10/20 - 21/10 is -8/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
10/20 = 10 × 1/20 × 1 = 10/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
21/10 = 21 × 2/10 × 2 = 42/20 - Subtract the two like fractions:
10/20 - 42/20 = 10 - 42/20 = -32/20 - After reducing the fraction, the answer is -8/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-42/10 10/40-21/10 10/20-21/20 30/20-21/10 10/20-63/10 10/60-21/10 10/20-21/30 50/20-21/10 10/20-21/50 70/20-21/10 10/20-21/70