Subtract 21/80 from 20/28
20/28 - 21/80 is 253/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 28 × 20 = 560,
20/28 = 20 × 20/28 × 20 = 400/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Subtract the two like fractions:
400/560 - 147/560 = 400 - 147/560 = 253/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-21/80 20/28-42/80 20/56-21/80 60/28-21/80 20/28-63/80 20/84-21/80