Subtract 20/90 from 15/12
1st number: 1 3/12, 2nd number: 20/90
15/12 - 20/90 is 37/36.
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,
15/12 = 15 × 15/12 × 15 = 225/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
20/90 = 20 × 2/90 × 2 = 40/180 - Subtract the two like fractions:
225/180 - 40/180 = 225 - 40/180 = 185/180 - After reducing the fraction, the answer is 37/36
- In mixed form: 11/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12-20/90 15/12-40/90 15/24-20/90 45/12-20/90 15/12-60/90 15/36-20/90 75/12-20/90 15/60-20/90 15/84-20/90