Answers

Add 1/80 and 7/81

1/80 + 7/81 is 641/6480.

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,
   1/80 = 1 × 81/80 × 81 = 81/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   7/81 = 7 × 80/81 × 80 = 560/6480
4. Add the two like fractions:
   81/6480 + 560/6480 = 81 + 560/6480 = 641/6480
5. So, 1/80 + 7/81 = 641/6480

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