Subtract 20/90 from 1/5
1/5 - 20/90 is -1/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
1/5 = 1 × 18/5 × 18 = 18/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
18/90 - 20/90 = 18 - 20/90 = -2/90 - After reducing the fraction, the answer is -1/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-20/90 1/5-40/90 1/10-20/90 3/5-20/90 1/5-60/90 1/15-20/90 1/25-20/90 7/5-20/90 1/35-20/90