Subtract 15/10 from 5/21
1st number: 5/21, 2nd number: 1 5/10
5/21 - 15/10 is -53/42.
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,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
15/10 = 15 × 21/10 × 21 = 315/210 - Subtract the two like fractions:
50/210 - 315/210 = 50 - 315/210 = -265/210 - After reducing the fraction, the answer is -53/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-15/10 5/21-30/10 5/42-15/10 5/21-15/20 15/21-15/10 5/21-45/10 5/63-15/10 5/21-15/30 25/21-15/10 5/21-75/10 5/21-15/50 35/21-15/10 5/21-15/70