"%%" and "%/%" for the remainder and the quotient

I am wondering how and why the operator %% and %/% are for the remainder and the quotient.

Is there any reason or history that R developer had given them the meaning they have?

 > 0 %/% 10
[1] 0
> 30 %% 10
[1] 0
> 35 %/% 10
[1] 3
> 35 %% 10
[1] 5