Subtract 90/27 from 15/18
1st number: 15/18, 2nd number: 3 9/27
15/18 - 90/27 is -5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 27 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
15/18 = 15 × 3/18 × 3 = 45/54 - Likewise, for the 2nd fraction, since 27 × 2 = 54,
90/27 = 90 × 2/27 × 2 = 180/54 - Subtract the two like fractions:
45/54 - 180/54 = 45 - 180/54 = -135/54 - After reducing the fraction, the answer is -5/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-90/27 15/36-90/27 15/18-90/54 45/18-90/27 15/54-90/27 15/18-90/81 75/18-90/27 15/90-90/27