When in primary school we were taught with coloured wooden blocks marked with notches how to count, addition, subtraction etc. For example ten was always red, five green, single units were yellow. To this day I still relate colours to shapes and numbers and vice versa. Red + green = 15. I'm 34 (three yellows + four yellows) and an accountant.
A childhood belief about counting

others believed things like this
- when i was little thought that ants changed traffic lights from green to red and vice versa.Anon
- I used to believe that if you mixed red, blue, green, and yellow paint you'd get plaid!— Judith Ann
- i used to believe that red yellow and green meant "ready, set, Go!" on traffic lights..— cabagona
- I used to believe there was a limit on the numbers you could count — Carmen
- I believed you had to color all the dinosaurs in coloring books green because all the dinosaurs WERE green.— Betty
- I used to think that girls' anuses were green. I remember thinking that as late as high school.— Jack