Chris Paddison

var my_number:Number = 5.2631578947368425;
 
trace("Round to whole number: "+Math.round(my_number));
trace("Round to 1 decimal place: "+Math.round(my_number*10)/10);
trace("Round to 2 decimal place: "+Math.round(my_number*100)/100);
trace("Round to 3 decimal place: "+Math.round(my_number*1000)/1000);
trace("Round to 4 decimal place: "+Math.round(my_number*10000)/10000);
trace("Round to 5 decimal place: "+Math.round(my_number*100000)/100000);
 
trace("Truncate to whole number: "+int(my_number));
trace("Truncate to 1 decimal place: "+int(my_number*10)/10);
trace("Truncate to 2 decimal place: "+int(my_number*100)/100);
trace("Truncate to 3 decimal place: "+int(my_number*1000)/1000);
trace("Truncate to 4 decimal place: "+int(my_number*10000)/10000);
trace("Truncate to 5 decimal place: "+int(my_number*100000)/100000);
 
trace("Round to nearest multiple of 5: "+Math.round(my_number/5)*5);
trace("Round to nearest multiple of 2: "+Math.round(my_number/2)*2);

// Rounds a target number to a specific number of decimal places.
function roundToPrecision(numberVal:Number, precision:int = 0):Number
{
	var decimalPlaces:Number = Math.pow(10, precision);
	return Math.round(decimalPlaces * numberVal) / decimalPlaces;
}

// Rounds a target number "to" the nearest multiple of another number.
function roundToNearest(numberVal:Number, roundTo:Number):Number
{
	return Math.round(numberVal / roundTo) * roundTo;
}
 
// Rounds a target number "up to" the nearest multiple of another number.
function roundUpToNearest(numberVal:Number, roundTo:Number):Number
{
	return Math.ceil(numberVal / roundTo) * roundTo;
}
 
// Rounds a target number "down to" the nearest multiple of another number.
function roundDownToNearest(numberVal:Number, roundTo:Number):Number
{
	return Math.floor(numberVal / roundTo) * roundTo;
}