Here's two thoughts. elsif and a dispatch table were other thoughts.

# A ternary
$test_nums = ( $total_nums <= 30 ? 1 :
           $total_nums <= 60 ? 2 :
           $total_nums <= 90 ? 3 :
           $total_nums <= 120 ? 4 :
           $total_nums <= 150 ? 5 :
           $total_nums <= 180 ? 6 :
           undef );

# Simple division
use POSIX 'ceil';
$test_nums = ceil( $total_nums / 30 );
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