Cut a piece of rectangular paper with a length of 45 cm and a width of 36 cm into squares with the same size and as large an area as possible. If there is no paper left, how many pieces can be cut at least?
把一张长45厘米，宽36厘米的长方形纸，裁成同样大小，面积尽可能大的正方形，纸没有剩余，至少可以裁多少个？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>