Subtract 90/27 from 12/15
1st number: 12/15, 2nd number: 3 9/27
12/15 - 90/27 is -38/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 15 × 9 = 135,
12/15 = 12 × 9/15 × 9 = 108/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
90/27 = 90 × 5/27 × 5 = 450/135 - Subtract the two like fractions:
108/135 - 450/135 = 108 - 450/135 = -342/135 - After reducing the fraction, the answer is -38/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-90/27 12/30-90/27 12/15-90/54 36/15-90/27 12/45-90/27 12/15-90/81 60/15-90/27 12/75-90/27 84/15-90/27