Subtract 6/80 from 21/18
1st number: 1 3/18, 2nd number: 6/80
21/18 - 6/80 is 131/120.
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,
21/18 = 21 × 40/18 × 40 = 840/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
6/80 = 6 × 9/80 × 9 = 54/720 - Subtract the two like fractions:
840/720 - 54/720 = 840 - 54/720 = 786/720 - After reducing the fraction, the answer is 131/120
- In mixed form: 111/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-6/80 21/18-12/80 21/36-6/80 63/18-6/80 21/18-18/80 21/54-6/80 21/18-30/80 21/90-6/80 21/18-42/80