8 tons of river sand, transported 3000kg, how many kilograms are left?
8吨河沙，运走了3000kg，还剩多少千克？
<gadget id="calculator">8 * 1_000</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 - 3_000</gadget>
<output>5_000</output>

<result>5_000</result>