Add 5/15 and 80/81
5/15 + 80/81 is 107/81.
Steps for adding 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,
5/15 = 5 × 27/15 × 27 = 135/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
80/81 = 80 × 5/81 × 5 = 400/405 - Add the two like fractions:
135/405 + 400/405 = 135 + 400/405 = 535/405 - 535/405 simplified gives 107/81
- So, 5/15 + 80/81 = 107/81
In mixed form: 126/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15+80/81 5/30+80/81 5/45+80/81 25/15+80/81 5/75+80/81 35/15+80/81