Subtract 20/18 from 45/24
1st number: 1 21/24, 2nd number: 1 2/18
45/24 - 20/18 is 55/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 24 × 3 = 72,
45/24 = 45 × 3/24 × 3 = 135/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
20/18 = 20 × 4/18 × 4 = 80/72 - Subtract the two like fractions:
135/72 - 80/72 = 135 - 80/72 = 55/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24-20/18 45/24-40/18 45/48-20/18 45/24-20/36 45/24-60/18 45/72-20/18 45/24-20/54 45/24-20/90