Subtract 3/8 from 21/80
21/80 - 3/8 is -9/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 8 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Likewise, for the 2nd fraction, since 8 × 10 = 80,
3/8 = 3 × 10/8 × 10 = 30/80 - Subtract the two like fractions:
21/80 - 30/80 = 21 - 30/80 = -9/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80-3/8 21/80-6/8 21/80-3/16 63/80-3/8 21/80-9/8 21/80-3/24 21/80-15/8 21/80-3/40 21/80-21/8 21/80-3/56