Use several small rectangular paper pieces with a length of 4 cm and a width of 3 cm to assemble a large square. At least how many such rectangular paper pieces are needed?
用几张长4厘米，宽3厘米的小长方形纸片拼一个大正方形，至少要多少张这样的长方形纸片？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>