Answers

Add 3/81 and 60/80

3/81 + 60/80 is 85/108.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 80 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 81 × 80 = 6480,
   3/81 = 3 × 80/81 × 80 = 240/6480
3. Likewise, for the 2nd fraction, since 80 × 81 = 6480,
   60/80 = 60 × 81/80 × 81 = 4860/6480
4. Add the two like fractions:
   240/6480 + 4860/6480 = 240 + 4860/6480 = 5100/6480
5. 5100/6480 simplified gives 85/108
6. So, 3/81 + 60/80 = 85/108

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