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calculation error

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I have some numbers like below and the final $temp amount should be 450 exact but the calculation ended up with 450.00000000001..

i have no idea what's going wrong ?

$p = 4592.05
$1 = 679.41
$2 = 661.31
$3 = 660.04
$4 = 648.06
$5 = 963.85
$6 = 529.38

$childsum = 0

$childsum += $1
$childsum += $2
$childsum += $3
$childsum += $4
$childsum += $5
$childsum += $6

$temp = $p -$childsum

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As all the amounts have 2 decimal places I would convert all of them to integers (i.e. multiply them by 100) so that I could use integer arithmetic to sum them. Then I would divide by 100 and use Round when I wanted the total back in 2 decimal place format. ;)


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