Subtract 45/20 from 21/24
1st number: 21/24, 2nd number: 2 5/20
21/24 - 45/20 is -11/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 20 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Likewise, for the 2nd fraction, since 20 × 6 = 120,
45/20 = 45 × 6/20 × 6 = 270/120 - Subtract the two like fractions:
105/120 - 270/120 = 105 - 270/120 = -165/120 - After reducing the fraction, the answer is -11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-45/20 21/24-90/20 21/48-45/20 21/24-45/40 63/24-45/20 21/72-45/20 21/24-45/60