Creating a number is easy, it can be done just like for any other variable type using the var keyword.
Numbers can be created from a constant value:
// This is a float:
var a = 1.2;
// This is an integer:
var b = 10;
Or from the value of another variable:
var a = 2;
var b = a;
Exercise
Create a variable x which equals 10 and create a variable y which equals a.
var a = 11;