Subtract 45/18 from 80/21
1st number: 3 17/21, 2nd number: 2 9/18
80/21 - 45/18 is 55/42.
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,
45/18 = 45 × 7/18 × 7 = 315/126 - Subtract the two like fractions:
480/126 - 315/126 = 480 - 315/126 = 165/126 - After reducing the fraction, the answer is 55/42
- In mixed form: 113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-90/18 80/42-45/18 80/21-45/36 80/63-45/18 80/21-45/54 80/21-45/90