Subtract 3/81 from 42/15
1st number: 2 12/15, 2nd number: 3/81
42/15 - 3/81 is 373/135.
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,
3/81 = 3 × 5/81 × 5 = 15/405 - Subtract the two like fractions:
1134/405 - 15/405 = 1134 - 15/405 = 1119/405 - After reducing the fraction, the answer is 373/135
- In mixed form: 2103/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15-3/81 42/15-6/81 42/30-3/81 42/15-9/81 42/45-3/81 42/15-15/81 42/75-3/81 42/15-21/81