Add 3/5 and 42/81
3/5 + 42/81 is 151/135.
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,
3/5 = 3 × 81/5 × 81 = 243/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
42/81 = 42 × 5/81 × 5 = 210/405 - Add the two like fractions:
243/405 + 210/405 = 243 + 210/405 = 453/405 - 453/405 simplified gives 151/135
- So, 3/5 + 42/81 = 151/135
In mixed form: 116/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/5+42/81 3/5+84/81 3/10+42/81 9/5+42/81 3/15+42/81 15/5+42/81 3/25+42/81 21/5+42/81 3/35+42/81