Subtract 10/81 from 42/27
1st number: 1 15/27, 2nd number: 10/81
42/27 - 10/81 is 116/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 27 × 3 = 81,
42/27 = 42 × 3/27 × 3 = 126/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
10/81 = 10 × 1/81 × 1 = 10/81 - Subtract the two like fractions:
126/81 - 10/81 = 126 - 10/81 = 116/81 - In mixed form: 135/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/27-10/81 42/27-20/81 42/54-10/81 42/27-30/81 42/81-10/81 42/27-50/81 42/27-70/81