Subtract 18/81 from 27/15
1st number: 1 12/15, 2nd number: 18/81
27/15 - 18/81 is 71/45.
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,
27/15 = 27 × 27/15 × 27 = 729/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Subtract the two like fractions:
729/405 - 90/405 = 729 - 90/405 = 639/405 - After reducing the fraction, the answer is 71/45
- In mixed form: 126/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15-18/81 27/15-36/81 27/30-18/81 81/15-18/81 27/15-54/81 27/45-18/81 27/15-90/81 27/75-18/81