How many small squares can be cut out of a rectangular cardboard with a length of 18 cm and a width of 4 cm.
一张长18厘米，宽4厘米的长方形纸板，可以剪出多少个个边长为2厘米的小正方形．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>