ribbon is 1 meter long, and 8 decimeters are used to wrap gifts. How many decimeters are left?
一条彩带长1米，包装礼品用去8分米，还剩多少分米？
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<result>2</result>