Hell, why stop there? 
sub round_to_nths {
    my ($num, $n) = @_;
    (int $num*$n)/$n
}

[download]
Now you and me can reuse our rounding code all day, giggling as the split-based solution chokes on a well-placed $num = '123E-1'...

In reply to Re^2: Round down to '.5' or '.0' by gamache
in thread Round down to '.5' or '.0' by awohld

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