Xiao Cong's family is planning to renovate the house recently, and the floor of Xiao Cong's bedroom is 45 decimeters long and 27 decimeters wide. The larger the square floor tiles in this room, the better, and the floor tiles cannot be cut. Please help to design. What is the maximum side length of the square floor tiles?
小聪家近日准备装修房子，量得小聪的卧室地面长45分米，宽27分米．要在这个房间正方形地面砖越大越好，且地面砖不能割开，请你帮助设计一下，正方形地面砖的边长最大是多少？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>