How many squares with side length 1 cm can be drawn on a rectangular piece of paper with a length of 6 cm and a width of 3 cm.
在一张长6厘米、宽3厘米的长方形纸上，可以画多少个边长为1厘米的正方形．
<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>