Subtract 45/80 from 21/8
1st number: 2 5/8, 2nd number: 45/80
21/8 - 45/80 is 33/16.
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,
45/80 = 45 × 1/80 × 1 = 45/80 - Subtract the two like fractions:
210/80 - 45/80 = 210 - 45/80 = 165/80 - After reducing the fraction, the answer is 33/16
- In mixed form: 21/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-45/80 21/8-90/80 21/16-45/80 63/8-45/80 21/24-45/80 21/40-45/80 21/56-45/80