Subtract 10/81 from 42/15
1st number: 2 12/15, 2nd number: 10/81
42/15 - 10/81 is 1084/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
42/15 = 42 × 27/15 × 27 = 1134/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
10/81 = 10 × 5/81 × 5 = 50/405 - Subtract the two like fractions:
1134/405 - 50/405 = 1134 - 50/405 = 1084/405 - In mixed form: 2274/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15-10/81 42/15-20/81 42/30-10/81 42/15-30/81 42/45-10/81 42/15-50/81 42/75-10/81 42/15-70/81