A rectangle with a length of 60 centimeters and a width of 45 centimeters is cut into several squares without any residue (the length of each side is a whole centimeter), how many pieces can be cut at least?
一个长60厘米宽45厘米的长方形，剪成若干正方形而没有剩余(边长都是整厘米数)，最少可以剪几块？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">60 / 15</gadget>
<output>4</output>

<gadget id="calculator">45 / 15</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>