There is a square iron block with a side length of 8dm. Now it is to be melted and cast into a square steel with a side length of 2dm in cross section. How long is this steel?
有一块棱长8dm的正方体铁块，现在要把它熔铸成一个横截面是边长2dm的正方体钢材，求这根钢材有多长？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">8 * 8 * 2</gadget>
<output>128</output>

<result>128</result>