Subtract 21/80 from 3/4
3/4 - 21/80 is 39/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 4 × 20 = 80,
3/4 = 3 × 20/4 × 20 = 60/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Subtract the two like fractions:
60/80 - 21/80 = 60 - 21/80 = 39/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4-21/80 3/4-42/80 3/8-21/80 9/4-21/80 3/4-63/80 3/12-21/80 15/4-21/80 3/20-21/80 21/4-21/80 3/28-21/80