How many smaller squares are there in a square with side length 4 cm?
边长为4厘米的正方形中有多少个边长为2厘米的小正方形．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>