Flash will not retain zeros after the last significant digit. Otherwise 1 would be 1.00000000... If you want to display the zero at the end you can use Robert's script but that returns a string so you have to remember to convert the result to a number before trying to do any more mathematical operations with it:
var1 = 123.24;
var2 = 345.56;
display = Math.formatDecimals(var1+var2, 2);
var3 = Number(display);
Here you can use var3 for math operations (like addition, subtraction, etc) but you can't use display, as it is a string, for display purposes only.
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