Answers

Add 18/81 and 6/40

18/81 + 6/40 is 67/180.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 81 × 40 = 3240,
   18/81 = 18 × 40/81 × 40 = 720/3240
3. Likewise, for the 2nd fraction, since 40 × 81 = 3240,
   6/40 = 6 × 81/40 × 81 = 486/3240
4. Add the two like fractions:
   720/3240 + 486/3240 = 720 + 486/3240 = 1206/3240
5. 1206/3240 simplified gives 67/180
6. So, 18/81 + 6/40 = 67/180

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