Subtract 63/80 from 21/8
1st number: 2 5/8, 2nd number: 63/80
21/8 - 63/80 is 147/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 8 × 10 = 80,
21/8 = 21 × 10/8 × 10 = 210/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
63/80 = 63 × 1/80 × 1 = 63/80 - Subtract the two like fractions:
210/80 - 63/80 = 210 - 63/80 = 147/80 - In mixed form: 167/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-63/80 21/16-63/80 63/8-63/80 21/24-63/80 21/40-63/80 21/56-63/80