Subtract 72/20 from 15/10
1st number: 1 5/10, 2nd number: 3 12/20
15/10 - 72/20 is -21/10.
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,
15/10 = 15 × 2/10 × 2 = 30/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
72/20 = 72 × 1/20 × 1 = 72/20 - Subtract the two like fractions:
30/20 - 72/20 = 30 - 72/20 = -42/20 - After reducing the fraction, the answer is -21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-72/20 15/20-72/20 15/10-72/40 45/10-72/20 15/30-72/20 15/10-72/60 75/10-72/20 15/50-72/20 15/70-72/20