Subtract 21/24 from 90/18
1st number: 5 0/18, 2nd number: 21/24
90/18 - 21/24 is 33/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 24 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
90/18 = 90 × 4/18 × 4 = 360/72 - Likewise, for the 2nd fraction, since 24 × 3 = 72,
21/24 = 21 × 3/24 × 3 = 63/72 - Subtract the two like fractions:
360/72 - 63/72 = 360 - 63/72 = 297/72 - After reducing the fraction, the answer is 33/8
- In mixed form: 41/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18-42/24 90/36-21/24 90/18-21/48 90/18-63/24 90/54-21/24 90/18-21/72