Subtract 25/80 from 20/21
20/21 - 25/80 is 215/336.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
20/21 = 20 × 80/21 × 80 = 1600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
25/80 = 25 × 21/80 × 21 = 525/1680 - Subtract the two like fractions:
1600/1680 - 525/1680 = 1600 - 525/1680 = 1075/1680 - After reducing the fraction, the answer is 215/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-25/80 20/21-50/80 20/42-25/80 60/21-25/80 20/21-75/80 20/63-25/80