Subtract 1/80 from 20/18
1st number: 1 2/18, 2nd number: 1/80
20/18 - 1/80 is 791/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 18 × 40 = 720,
20/18 = 20 × 40/18 × 40 = 800/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
1/80 = 1 × 9/80 × 9 = 9/720 - Subtract the two like fractions:
800/720 - 9/720 = 800 - 9/720 = 791/720 - In mixed form: 171/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18-1/80 20/18-2/80 20/36-1/80 60/18-1/80 20/18-3/80 20/54-1/80 20/18-5/80 20/90-1/80 20/18-7/80