Subtract 21/8 from 45/5
1st number: 9 0/5, 2nd number: 2 5/8
45/5 - 21/8 is 51/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
45/5 = 45 × 8/5 × 8 = 360/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Subtract the two like fractions:
360/40 - 105/40 = 360 - 105/40 = 255/40 - After reducing the fraction, the answer is 51/8
- In mixed form: 63/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-21/8 45/5-42/8 45/10-21/8 45/5-21/16 45/5-63/8 45/15-21/8 45/5-21/24 45/25-21/8 45/5-21/40 45/35-21/8 45/5-21/56