Xiao Ming is going to collect 867 waste batteries. He has collected 8 days, and the collection is only 298. How many waste batteries has Xiao Ming collected?
小明准备收集867节废电池，已经收集了8天，还差298节就收集完成了，小明已经收集了多少节废电池？
<gadget id="calculator">867 - 298</gadget>
<output>569</output>

<result>569</result>