Wang Meng uses rectangular colored paper with a length of 18 cm and a width of 12 cm to make a square, at least how many pieces of such rectangular colored paper are used?
王萌用长18厘米，宽12厘米的长方形彩纸拼一个正方形至少用多少张这样的长方形彩纸？
<gadget id="calculator">2 * 2 * 3 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 / 18</gadget>
<output>2</output>

<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>