Add 84/81 and 12/5
1st number: 1 3/81, 2nd number: 2 2/5
84/81 + 12/5 is 464/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 5 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
84/81 = 84 × 5/81 × 5 = 420/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
12/5 = 12 × 81/5 × 81 = 972/405 - Add the two like fractions:
420/405 + 972/405 = 420 + 972/405 = 1392/405 - 1392/405 simplified gives 464/135
- So, 84/81 + 12/5 = 464/135
In mixed form: 359/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81+24/5 84/81+12/10 84/81+36/5 84/81+12/15 84/81+60/5 84/81+12/25 84/81+84/5 84/81+12/35