Subtract 3/20 from 90/5
1st number: 18 0/5, 2nd number: 3/20
90/5 - 3/20 is 357/20.
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,
90/5 = 90 × 4/5 × 4 = 360/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
3/20 = 3 × 1/20 × 1 = 3/20 - Subtract the two like fractions:
360/20 - 3/20 = 360 - 3/20 = 357/20 - In mixed form: 1717/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-6/20 90/10-3/20 90/5-3/40 90/5-9/20 90/15-3/20 90/5-3/60 90/5-15/20 90/25-3/20 90/5-21/20 90/35-3/20