What is The value of 99.9 repeating plus 9.9 repeating plus 9 repeating?

Answer 1

Well 99.99999(repeating) = 100

The rigorous proof for this involves expressing 99.9999...9 as a geometric series and then calculating the number to which is converges, which is exactly 100. Interesting huh? Or you can think about it like this: Since there is no number you can chose that is between 99.9999(repeating) and 100, which is impossible for two different numbers, they must be equal.

This also applies here: 9.9999(repeating) = 10

So 99.99(repeating) + 9.99(repeating) = 110.

However 9 repeating = Infinity.

Therefor your answer is simply infinity, as infinity is not a number so you can not get Infinity + 110.

99.9 repeating plus 9.9 repeating plus 9 repeating = infinity