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    elsif($length == 2) {
        $num = (substr($num, 0, 1) + 1) . ('0'x($length-1));
}
  2. or download this
    elsif($length == 2) {
        $num = (substr($num, 0, 1) + 1) . '0';
}
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    elseif($length == 2){
    $num = int($num/10) * 10;
}