Subtract 4/90 from 18/36
18/36 - 4/90 is 41/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
18/36 = 18 × 5/36 × 5 = 90/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
4/90 = 4 × 2/90 × 2 = 8/180 - Subtract the two like fractions:
90/180 - 8/180 = 90 - 8/180 = 82/180 - After reducing the fraction, the answer is 41/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36-8/90 18/72-4/90 54/36-4/90 18/36-12/90 90/36-4/90 18/36-20/90 18/36-28/90