Subtract 2/20 from 18/36
18/36 - 2/20 is 2/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 20 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 20 × 9 = 180,
2/20 = 2 × 9/20 × 9 = 18/180 - Subtract the two like fractions:
90/180 - 18/180 = 90 - 18/180 = 72/180 - After reducing the fraction, the answer is 2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36-4/20 18/72-2/20 18/36-2/40 54/36-2/20 18/36-6/20 18/36-2/60 90/36-2/20 18/36-10/20 18/36-14/20