In a rectangle with a length of 7 decimeters and a width of 4 decimeters, how many small squares with a side length of 1 decimeter can be placed in total.
在长7分米，宽4分米的长方形中，一共可以摆多少个边长1分米的小正方形．
<gadget id="calculator">7 / 1</gadget>
<output>7</output>

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

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

<result>28</result>