Subtract 90/18 from 20/75
1st number: 20/75, 2nd number: 5 0/18
20/75 - 90/18 is -71/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 18 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
20/75 = 20 × 6/75 × 6 = 120/450 - Likewise, for the 2nd fraction, since 18 × 25 = 450,
90/18 = 90 × 25/18 × 25 = 2250/450 - Subtract the two like fractions:
120/450 - 2250/450 = 120 - 2250/450 = -2130/450 - After reducing the fraction, the answer is -71/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75-90/18 20/75-90/36 60/75-90/18 20/75-90/54