Xiao Ming has done 24 math problems and has completed 16. How much of all the problems still need to be completed?
小明做24道数学题，已完成了16道，还需完成全部题目的多少
<gadget id="calculator">24 - 16</gadget>
<output>8</output>

<gadget id="calculator">8 / 24</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>