Subtract 15/90 from 20/12
1st number: 1 8/12, 2nd number: 15/90
20/12 - 15/90 is 3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
20/12 = 20 × 15/12 × 15 = 300/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
15/90 = 15 × 2/90 × 2 = 30/180 - Subtract the two like fractions:
300/180 - 30/180 = 300 - 30/180 = 270/180 - After reducing the fraction, the answer is 3/2
- In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-15/90 20/12-30/90 20/24-15/90 60/12-15/90 20/12-45/90 20/36-15/90 20/12-75/90 20/60-15/90 20/84-15/90