Answers

Add 20/81 and 48/80

20/81 + 48/80 is 343/405.

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,
   20/81 = 20 × 80/81 × 80 = 1600/6480
3. Likewise, for the 2nd fraction, since 80 × 81 = 6480,
   48/80 = 48 × 81/80 × 81 = 3888/6480
4. Add the two like fractions:
   1600/6480 + 3888/6480 = 1600 + 3888/6480 = 5488/6480
5. 5488/6480 simplified gives 343/405
6. So, 20/81 + 48/80 = 343/405

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