How many smaller squares are there in a square with a side length of 3 cm?
边长为3厘米的正方形中有多少个边长是1厘米的小正方形．
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

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

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>