Answers

Add 5/80 and 63/81

5/80 + 63/81 is 121/144.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 81 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 80 × 81 = 6480,
   5/80 = 5 × 81/80 × 81 = 405/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   63/81 = 63 × 80/81 × 80 = 5040/6480
4. Add the two like fractions:
   405/6480 + 5040/6480 = 405 + 5040/6480 = 5445/6480
5. 5445/6480 simplified gives 121/144
6. So, 5/80 + 63/81 = 121/144

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