Subtract 15/90 from 12/18
12/18 - 15/90 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
12/18 = 12 × 5/18 × 5 = 60/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
15/90 = 15 × 1/90 × 1 = 15/90 - Subtract the two like fractions:
60/90 - 15/90 = 60 - 15/90 = 45/90 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-15/90 12/18-30/90 12/36-15/90 36/18-15/90 12/18-45/90 12/54-15/90 60/18-15/90 12/18-75/90 12/90-15/90 84/18-15/90