ActionScript 3.0 :: Math Functions - Starting Variable Status Strength With 10

I am learning AS3 and I try to remake an SimDate game. I have studies the functions and the Steps of the game and now I try to make the Functions myself.

I have 5 Attributes:
Strength
Knowledge
Charm
Health
Dollars

For each of them I have defined a variable. Now I need to make an math function. If I want to raise str:
statusstrenght = statusstrenght + addstr

This code is not the original. My other code is down below. I only wanted to show the process.
addstr == Math.random() *5
I wanted that the variable statusstrenght starts with 10. If I press the train Strenghtbutton the action addstr will be started and updates the statusstr with the new value. That's what I had in mind but I cant define the new value off statusstrenght + addstr. Do I have to add a new variable with newstatusstrenght or can I just overwrite the value of statusstrenght if I press the train strength button ?

Here is the code. The math functions aren't working. It is AS3.
import flash.events.*;
var statusstrenght:Number = 10;
var statusknowledge:Number = 10;
var statuscharme:Number = 10;
var statushealth:uint = 100;
var statusdollar:uint = 100;
[Code] .....