Subtract 5/20 from 10/90
10/90 - 5/20 is -5/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
10/90 = 10 × 2/90 × 2 = 20/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
5/20 = 5 × 9/20 × 9 = 45/180 - Subtract the two like fractions:
20/180 - 45/180 = 20 - 45/180 = -25/180 - After reducing the fraction, the answer is -5/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90-5/20 10/90-10/20 10/90-5/40 30/90-5/20 10/90-15/20 10/90-5/60 50/90-5/20 10/90-25/20 70/90-5/20 10/90-35/20