A sidewalk is 40 decimeters long and 12 meters wide. If you use small cement square bricks with an area of 4 square decimeters to pave this road, how many such cement square bricks are needed?
一条人行道长40分米，宽12米，如果用面积是4平方分米的小水泥方砖铺这条道，需要这样的水泥方砖多少块？
<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">40 * 30</gadget>
<output>1_200</output>

<result>1_200</result>