Subtract 21/50 from 3/10
3/10 - 21/50 is -3/25.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 50 is 50
Next, find the equivalent fraction of both fractional numbers with denominator 50 - For the 1st fraction, since 10 × 5 = 50,
3/10 = 3 × 5/10 × 5 = 15/50 - Likewise, for the 2nd fraction, since 50 × 1 = 50,
21/50 = 21 × 1/50 × 1 = 21/50 - Subtract the two like fractions:
15/50 - 21/50 = 15 - 21/50 = -6/50 - After reducing the fraction, the answer is -3/25
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10-21/50 3/10-42/50 3/20-21/50 9/10-21/50 3/10-63/50 3/30-21/50 15/10-21/50 3/50-21/50 21/10-21/50 3/70-21/50