I used to believe that the only types of math problems that existed were addition, subtraction, multiplication, and division.
A childhood belief about counting

others believed things like this
- I used to believe that 7 times 12 was equal to 83 or 84, depending on the math problem.— Eric Swensen
- I used to believe that "critical acclaim" meant that they liked it, BUT had some major problems with it, too.— Beth
- I used to believe Santa existed— Joaquin E. Hurtado
- When I was kid I used to believe that I had to earn enough money to have one of everything that existed.Anon
- I used to believe that female roosters existed. Anon
- When I was little I believed that only Spain existed — Khadija El Hattabe