Subtract 3/18 from 80/21
1st number: 3 17/21, 2nd number: 3/18
80/21 - 3/18 is 51/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
80/21 = 80 × 6/21 × 6 = 480/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
3/18 = 3 × 7/18 × 7 = 21/126 - Subtract the two like fractions:
480/126 - 21/126 = 480 - 21/126 = 459/126 - After reducing the fraction, the answer is 51/14
- In mixed form: 39/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-6/18 80/42-3/18 80/21-3/36 80/21-9/18 80/63-3/18 80/21-3/54 80/21-15/18 80/21-3/90 80/21-21/18