Mom bought 1 kilogram of salt and used 200 grams. How many grams are left?
妈妈买回1千克盐，用去200克，还剩多少克？
<gadget id="calculator">1 * 1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 200</gadget>
<output>800</output>

<result>800</result>