Add 18/81 and 42/40
1st number: 18/81, 2nd number: 1 2/40
18/81 + 42/40 is 229/180.
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,
18/81 = 18 × 40/81 × 40 = 720/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
42/40 = 42 × 81/40 × 81 = 3402/3240 - Add the two like fractions:
720/3240 + 3402/3240 = 720 + 3402/3240 = 4122/3240 - 4122/3240 simplified gives 229/180
- So, 18/81 + 42/40 = 229/180
In mixed form: 149/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/81+42/40 18/81+84/40 18/81+42/80 54/81+42/40 90/81+42/40