Esperanto the most useful language to learn if you want to proceed to other languages?; EasyMath?

[gustavolacerda]

Esperanto may be the most useful language to learn if you want to learn other languages.

http://en.wikipedia.org/wiki/Propedeutic_value_of_Esperanto

I wonder if, analogously, there exists an "easy math". After being comfortable with EasyMath, most kids would have a much easier time learning other math.
Is "logic" an EasyMath? are some video games?