Subtract 4/80 from 15/20
15/20 - 4/80 is 7/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
15/20 = 15 × 4/20 × 4 = 60/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
4/80 = 4 × 1/80 × 1 = 4/80 - Subtract the two like fractions:
60/80 - 4/80 = 60 - 4/80 = 56/80 - After reducing the fraction, the answer is 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-4/80 15/20-8/80 15/40-4/80 45/20-4/80 15/20-12/80 15/60-4/80 75/20-4/80 15/20-20/80 15/20-28/80