Add 15/81 and 70/40
1st number: 15/81, 2nd number: 1 30/40
15/81 + 70/40 is 209/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 40 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 81 × 40 = 3240,
15/81 = 15 × 40/81 × 40 = 600/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
70/40 = 70 × 81/40 × 81 = 5670/3240 - Add the two like fractions:
600/3240 + 5670/3240 = 600 + 5670/3240 = 6270/3240 - 6270/3240 simplified gives 209/108
- So, 15/81 + 70/40 = 209/108
In mixed form: 1101/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81+70/40 15/81+70/80 45/81+70/40 75/81+70/40