Using a piece of rectangular fabric with a length of 15 decimeters and a width of 9 decimeters to make a square handkerchief with the same size and as large an area as possible, and there is no excess fabric, how many pieces can be made at least?
用一块长15分米、宽9分米的长方形布料做成同样大小、面积尽可能大的正方形手帕，而且没有布料多余，至少可以做多少块？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>