Can anyone explain this?
what am I doing wrong?
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Math.Round(x:Number) rounds x to the nearest integer value. In your case 28 is the nearest integer value for 28.499999999999996. So here the behavior is correct. What is weird is that 0.285 * 100 is not 28.5, but that is a consequence of the precision of the Number class in as3. Here is a little more information about this and a possible solution:
Innacurate math results
Also you can see this SO question:
Very strange number operation issue
Hope this helps.