Im probably not the only one that thought this but when I was like 3-4 ish when I first started getting into learning and such (Like Math) I thought 1+1=11 because two 1's puttogether are 11 (Double one)
A childhood belief about counting

others believed things like this
- When I first started learning to read I was convinced that vowels were called barnacles.— Andy Howell
- When I was learning the alphabet,I thought elemeno was one word.— Rick H.
- I used to believe that 7 times 12 was equal to 83 or 84, depending on the math problem.— Eric Swensen
- Some sport cars have a double exhaust. I wondered why. Why would people want to pollute twice as much?— F*ck the environment?
- I used to believe that the solid double yellow lines on highways were the motorcycle lane.— jeech
- I believed that the gap between the double yellow lines in the road was a special lane for motorcycles.— Joel