Question

mr. Fido Dido does not understand numbers but id good with words . please convert numbers to words for him . 84% of smart phone users notice ads on their phone .

Answer 1

"84%" is read as "84 percent",
which literally means "84 per century" or "84 per hundred."

So the given statement is actually saying this :
About $84$ out of every $100$ smart phone users notice ads on their phone.

$84$ out of $100$ is written as $\dfrac{84}{100}$ and we say "eighty four percent."

Answer 2

It means that 84 per cent of people or 84 per century which means 84:100 or 84 for people get ads on their phones out of 100 people