Subtract 15/72 from 90/18
1st number: 5 0/18, 2nd number: 15/72
90/18 - 15/72 is 115/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 72 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 72 × 1 = 72,
15/72 = 15 × 1/72 × 1 = 15/72 - Subtract the two like fractions:
360/72 - 15/72 = 360 - 15/72 = 345/72 - After reducing the fraction, the answer is 115/24
- In mixed form: 419/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18-30/72 90/36-15/72 90/18-45/72 90/54-15/72 90/18-75/72