Subtract 1/80 from 15/20
15/20 - 1/80 is 59/80.
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,
1/80 = 1 × 1/80 × 1 = 1/80 - Subtract the two like fractions:
60/80 - 1/80 = 60 - 1/80 = 59/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-1/80 15/20-2/80 15/40-1/80 45/20-1/80 15/20-3/80 15/60-1/80 75/20-1/80 15/20-5/80 15/20-7/80