When my older sister was learning French at secondary school, she would practice numbers and verbs etc. Somehow I got it into my head that it went un, deux, trois etc up to 13, when I thought it went quatorze, cans, tins, and then I couldnt remember any more numbers! I was repeatedly told by my family this was incorrect, but it wasn't until I got to school was taught the numbers that I had to work really hard to forget cans and tins and continue on to vingt and beyond!
A childhood belief about foreign languages

others believed things like this
- I used to believe that numbers had gender, that the odd numbers were boys and even numbers were girls. — Evelyn
- I used to be terrified of the numbers 18 and 19. I think I thought that when you turned 18 or 19, you die.— Emmy
- Numbers went up to 100 then restarted at zero.Anon
- The highest of all numbers was "a finnety."— Becky
- i used to belive that 1 to 10 were the only numbers and all others were made up.....— Eric
- I used to believe there was a limit on the numbers you could count — Carmen