A square welcome wall can be covered with square tiles with a side length of 8 decimeters or square tiles with a side length of 10 decimeters. In both cases, there is no need to cut bricks. How many centimeters is the minimum side length of this welcome wall?
一个正方形迎宾墙，既可以沾上边长是8分米的正方形瓷砖，也可以沾上边长是10分米的正方形瓷砖，两种情况都正好不用切砖．这个迎宾墙的边长至少是多少厘米？
<gadget id="calculator">2 * 2 * 2 * 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 10</gadget>
<output>400</output>

<result>400</result>