Subtract 8/20 from 5/90
5/90 - 8/20 is -31/90.
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,
5/90 = 5 × 2/90 × 2 = 10/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
8/20 = 8 × 9/20 × 9 = 72/180 - Subtract the two like fractions:
10/180 - 72/180 = 10 - 72/180 = -62/180 - After reducing the fraction, the answer is -31/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/90-8/20 5/90-16/20 5/90-8/40 15/90-8/20 5/90-24/20 5/90-8/60 25/90-8/20 5/90-40/20 35/90-8/20 5/90-56/20