Grandma uses a square piece of fabric to make square scarves. You can make square scarves with a side length of 8 cm, or you can make square scarves with a side length of 10 cm. There is no surplus. What is the minimum length of the side of this square cloth in cm?
奶奶用一块正方形的布料做方巾，既可以都做边长是8cm的方巾，也可以都做成边长是10cm的方巾，都没有剩余．这块正方形布料的边长至少是多少cm．
<gadget id="calculator">2 * 2 * 2 * 5</gadget>
<output>40</output>

<result>40</result>