Xiaoling's room is 4 meters long and 3.5 meters wide. If you choose square floor tiles with a side length of 0.5 meters, at least how many such square tiles are needed?
小玲的房间长4米，宽3.5米，如果选用边长0.5米的正方形地砖铺地，至少需要多少块这样的方砖？
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