Subtract 40/27 from 42/15
1st number: 2 12/15, 2nd number: 1 13/27
42/15 - 40/27 is 178/135.
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,
42/15 = 42 × 9/15 × 9 = 378/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
40/27 = 40 × 5/27 × 5 = 200/135 - Subtract the two like fractions:
378/135 - 200/135 = 378 - 200/135 = 178/135 - In mixed form: 143/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15-40/27 42/15-80/27 42/30-40/27 42/15-40/54 42/45-40/27 42/15-40/81 42/75-40/27