Some shapes are cousins, and telling them apart takes a sharp eye. This Pre-K odd one out shapes worksheet with pentagons lines up five rows of plain gray outlines. Each row repeats one shape four times and slips in a single different one. The child scans the row from left to right and circles the shape that breaks the rule. Because two rows pair shapes with straight sides, the task asks for more than a glance. As a result, it trains visual discrimination, the skill of noticing small differences.