I used to think that if you wanted to count from 100 to 200, you counted "100, 101, 102..." and so on, until you got to 109. Then it was 200. That belief only lasted about a day or two.
A childhood belief about counting

others believed things like this
- I thought that Count Dracula was the count from Sesame StreetAnon
- When I was 10 years old, I used to believe that the accountants always counted money all the time.— Claudia P. R.G.
- I used to believe that copying definitions out of a book counted as plagiarism!Anon
- I used to believe the way they counted up votes was by counting the signs people used to put on their yards— Jaci Marshall
- I used to believe that Automatic Toll Boths had underground room where people counted your money.— Dillon
- I used to believe that eg 1+1=11 and 2+2=22.
Luckily that only lasted until age 2 1/2.— Madi