Xiaoying's family sold 6,300 kilograms of rice in July 2012, and 4 tons of 500 kilograms in August. How much less rice did Xiaoying's family sell in August than in July?
小英家2012年七月份卖出6300千克大米，八月份卖出4吨500千克，小英家八月份比七月份少卖出多少大米？
<gadget id="calculator">6_300 - 4_500</gadget>
<output>1_800</output>

<result>1_800</result>