It takes 400 pieces to pave the floor with square bricks with an area of 16 decimeters. If the floor is paved with square bricks with a side length of 5 decimeters, how many pieces are needed?
用面积是16平方分米的方砖铺地，需400块，如果改用边长5分米的方砖铺地，那么需要多少块？
<gadget id="calculator">16 * 400</gadget>
<output>6_400</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">6_400 / 25</gadget>
<output>256</output>

<result>256</result>