Subtract 9/90 from 9/12
9/12 - 9/90 is 13/20.
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,
9/12 = 9 × 15/12 × 15 = 135/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
9/90 = 9 × 2/90 × 2 = 18/180 - Subtract the two like fractions:
135/180 - 18/180 = 135 - 18/180 = 117/180 - After reducing the fraction, the answer is 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-9/90 9/12-18/90 9/24-9/90 27/12-9/90 9/12-27/90 9/36-9/90 45/12-9/90 9/12-45/90 9/60-9/90 63/12-9/90 9/12-63/90 9/84-9/90