The grain store shipped 1 ton of rice and sold 340 kilograms. How many kilograms are left?
粮店运来1吨大米，已经卖出340千克，还剩多少千克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 340</gadget>
<output>660</output>

<result>660</result>