Put together some rectangular cardboards with a length of 9 cm and a width of 6 cm to form a large square, at least how many such rectangular cardboards are needed.
把一些长9厘米，宽6厘米的长方形纸板拼成一个大正方形，至少需要多少块这样的长方形纸板．
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 * (1/3)</gadget>
<output>2</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

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

<result>6</result>