A pencil was originally 9 cm long, but 8 mm has been used. How long is the pencil now?
一支铅笔原长9厘米，用去了8毫米，现在这支铅笔有多长？
<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">90 - 8</gadget>
<output>82</output>

<result>82</result>