Subtract 90/20 from 1/5
1st number: 1/5, 2nd number: 4 10/20
1/5 - 90/20 is -43/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
1/5 = 1 × 4/5 × 4 = 4/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
90/20 = 90 × 1/20 × 1 = 90/20 - Subtract the two like fractions:
4/20 - 90/20 = 4 - 90/20 = -86/20 - After reducing the fraction, the answer is -43/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-90/20 1/10-90/20 1/5-90/40 3/5-90/20 1/15-90/20 1/5-90/60 1/25-90/20 7/5-90/20 1/35-90/20