Subtract 8/90 from 9/12
9/12 - 8/90 is 119/180.
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,
8/90 = 8 × 2/90 × 2 = 16/180 - Subtract the two like fractions:
135/180 - 16/180 = 135 - 16/180 = 119/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-8/90 9/12-16/90 9/24-8/90 27/12-8/90 9/12-24/90 9/36-8/90 45/12-8/90 9/12-40/90 9/60-8/90 63/12-8/90 9/12-56/90 9/84-8/90