Subtract 60/20 from 80/21
1st number: 3 17/21, 2nd number: 3 0/20
80/21 - 60/20 is 17/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
80/21 = 80 × 20/21 × 20 = 1600/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
60/20 = 60 × 21/20 × 21 = 1260/420 - Subtract the two like fractions:
1600/420 - 1260/420 = 1600 - 1260/420 = 340/420 - After reducing the fraction, the answer is 17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42-60/20 80/21-60/40 80/63-60/20