Subtract 90/5 from 20/4
1st number: 5 0/4, 2nd number: 18 0/5
20/4 - 90/5 is -13/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
20/4 = 20 × 5/4 × 5 = 100/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
90/5 = 90 × 4/5 × 4 = 360/20 - Subtract the two like fractions:
100/20 - 360/20 = 100 - 360/20 = -260/20 - After reducing the fraction, the answer is -13/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/4-90/5 20/8-90/5 20/4-90/10 60/4-90/5 20/12-90/5 20/4-90/15 20/4-90/25 20/28-90/5 20/4-90/35