Subtract 5/18 from 12/90
12/90 - 5/18 is -13/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
5/18 = 5 × 5/18 × 5 = 25/90 - Subtract the two like fractions:
12/90 - 25/90 = 12 - 25/90 = -13/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-5/18 12/90-10/18 12/90-5/36 36/90-5/18 12/90-15/18 12/90-5/54 60/90-5/18 12/90-25/18 12/90-5/90 84/90-5/18 12/90-35/18