Xiao Ming's pencil used to be 17 cm long, but 10 mm was used today. How long is Xiao Ming's pencil left?
小明的铅笔原来长17厘米，今天用去了10毫米．小明的铅笔还剩多长？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<result>16</result>