The floor of the little red room is rectangular, the length of the floor is 40dm, and the width is 32dm. If square floor tiles are used to cover the floor, the side length of the floor tiles is required to be an integer. What is the maximum side length of the floor tiles?
小红房间的地面是长方形的，地面长为40dm，宽为32dm，如果用正方形地砖铺满地面，要求地砖的边长是整数，地砖的边长最大是多少？
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>