Subtract 21/8 from 21/80
1st number: 21/80, 2nd number: 2 5/8
21/80 - 21/8 is -189/80.
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,
21/8 = 21 × 10/8 × 10 = 210/80 - Subtract the two like fractions:
21/80 - 210/80 = 21 - 210/80 = -189/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80-21/8 21/80-42/8 21/80-21/16 63/80-21/8 21/80-63/8 21/80-21/24 21/80-21/40 21/80-21/56