Subtract 30/20 from 90/5
1st number: 18 0/5, 2nd number: 1 10/20
90/5 - 30/20 is 33/2.
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,
30/20 = 30 × 1/20 × 1 = 30/20 - Subtract the two like fractions:
360/20 - 30/20 = 360 - 30/20 = 330/20 - After reducing the fraction, the answer is 33/2
- In mixed form: 161/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-60/20 90/10-30/20 90/5-30/40 90/5-90/20 90/15-30/20 90/5-30/60 90/25-30/20 90/35-30/20