Last month, the furniture factory produced 1,500 single wooden beds, 1,850 double wooden beds, and 2,500 iron beds. How many fewer iron beds were produced than wooden beds?
家具厂上个月生产单人木床1500张，双人木床1850张，铁床2500张，铁床比木床少生产多少张？
<gadget id="calculator">1_850 - 2_500</gadget>
<output>-650</output>

<gadget id="calculator">1_500 + (-650)</gadget>
<output>850</output>

<result>850</result>