Add 2/5 and 15/81
2/5 + 15/81 is 79/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
2/5 = 2 × 81/5 × 81 = 162/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
15/81 = 15 × 5/81 × 5 = 75/405 - Add the two like fractions:
162/405 + 75/405 = 162 + 75/405 = 237/405 - 237/405 simplified gives 79/135
- So, 2/5 + 15/81 = 79/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/5+15/81 2/5+30/81 2/10+15/81 6/5+15/81 2/5+45/81 2/15+15/81 10/5+15/81 2/5+75/81 2/25+15/81 14/5+15/81 2/35+15/81