Subtract 4/90 from 20/75
20/75 - 4/90 is 2/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 90 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 90 × 5 = 450,
4/90 = 4 × 5/90 × 5 = 20/450 - Subtract the two like fractions:
120/450 - 20/450 = 120 - 20/450 = 100/450 - After reducing the fraction, the answer is 2/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75-4/90 20/75-8/90 60/75-4/90 20/75-12/90 20/75-20/90 20/75-28/90