Subtract 30/20 from 21/10
1st number: 2 1/10, 2nd number: 1 10/20
21/10 - 30/20 is 3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 10 × 2 = 20,
21/10 = 21 × 2/10 × 2 = 42/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
30/20 = 30 × 1/20 × 1 = 30/20 - Subtract the two like fractions:
42/20 - 30/20 = 42 - 30/20 = 12/20 - After reducing the fraction, the answer is 3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-30/20 21/10-60/20 21/20-30/20 21/10-30/40 63/10-30/20 21/10-90/20 21/30-30/20 21/10-30/60 21/50-30/20 21/70-30/20