@Justicar

They also have a much more logical system of counting that allows them to reach very high levels of fast, mental arithmetic.

11 = "ten one"
12 = "ten two"
13 = "ten three"
20 = "two ten"

etc...

We waste time remembering unique words like eleven, twelve and thirteen. That's an inefficient use of brain power, much like QWERTY is an inefficient way to type.

I have no doubt that developmentally this helps to structure and optimize their brain in different ways than us.