The rectangle is 28cm long and 12cm wide. Divide it into several small squares, nothing left. How many can be divided into at least?
长方形长28cm、宽12cm．将它分成若干个小正方形，没有剩余．最少可以分成多少个？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

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

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>