Subtract 30/18 from 90/20
1st number: 4 10/20, 2nd number: 1 12/18
90/20 - 30/18 is 17/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
30/18 = 30 × 10/18 × 10 = 300/180 - Subtract the two like fractions:
810/180 - 300/180 = 810 - 300/180 = 510/180 - After reducing the fraction, the answer is 17/6
- In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20-60/18 90/40-30/18 90/20-30/36 90/20-90/18 90/60-30/18 90/20-30/54 90/20-30/90