The workshop plans to process 900 parts, 271 parts are completed in the morning, and 379 parts are processed in the afternoon. How many parts will be processed tomorrow?
车间计划要加工900个零件，上午完成了271个零件，下午加工379个零件，明天还有要加工多少个零件？
<gadget id="calculator">271 + 379</gadget>
<output>650</output>

<gadget id="calculator">900 - 650</gadget>
<output>250</output>

<result>250</result>