Subtract 4/8 from 21/80
21/80 - 4/8 is -19/80.
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,
4/8 = 4 × 10/8 × 10 = 40/80 - Subtract the two like fractions:
21/80 - 40/80 = 21 - 40/80 = -19/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80-4/8 21/80-4/16 63/80-4/8 21/80-12/8 21/80-4/24 21/80-20/8 21/80-4/40 21/80-28/8 21/80-4/56