There is a rectangular decorative board with a length of 40cm and a width of 25cm. At least how many such decorative boards should be used. To form a large square?
有一块长方形装饰板材，长40cm，宽25cm，至少要用多少块这样的装饰板材．才能拼成一个大正方形？
<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<gadget id="calculator">5 / 40</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>