A box of chocolates has 16 pieces of equal size, and Xiao Pang and Xiao Ding Ding each ate 4 of them, so how many boxes of chocolates are left?
一盒巧克力有大小相等的16块，小胖和小丁丁各吃了其中的4块，那么还剩下多少盒巧克力．
<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">16 - 8</gadget>
<output>8</output>

<gadget id="calculator">8 / 16</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>