Subtract 42/18 from 27/15
1st number: 1 12/15, 2nd number: 2 6/18
27/15 - 42/18 is -8/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
27/15 = 27 × 6/15 × 6 = 162/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
162/90 - 210/90 = 162 - 210/90 = -48/90 - After reducing the fraction, the answer is -8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15-42/18 27/15-84/18 27/30-42/18 27/15-42/36 81/15-42/18 27/45-42/18 27/15-42/54 27/75-42/18 27/15-42/90