When I was 4 or 5 I thought when you wrote down a number above twenty you combined numbers to get it. (example - 46 would be 406.
A childhood belief about counting

others believed things like this
- I used to believe there were numbers called "onety" and 'twoty." I thought "twoty-nine" came before twenty.— CC
- I used to believe that twenty was the largest number in the universe.— Bernardo Fernandez
- I used to believe that numbers had gender, that the odd numbers were boys and even numbers were girls. — Evelyn
- I used to believe that after the number "ten" came the numbers "tendy-one, tendy-two..." etc.Anon
- when i was little i believed that your social security number was the number you were born on the earth — christine
I used to believe that some insects had twenty lives.LOLAnon