How many sheets can be cut from a piece of rectangular paper with a length of 100 cm and a width of 80 cm into a square of the same size with the largest possible area and no surplus?
把一张长100厘米，宽80厘米的长方形纸裁成同样大小，面积尽可能大的正方形且没有剩余，能裁成多少张？
<gadget id="calculator">2 * 2 * 5</gadget>
<output>20</output>

<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">80 / 20</gadget>
<output>4</output>

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

<result>20</result>