Xiao Ming has an oil pastel stick that used to be 6 cm long, but 5 mm is used up today, so how many mm is left?
小明有一根油画棒原来长6厘米，今天用去了5毫米，那么还有多少毫米．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">60 - 5</gadget>
<output>55</output>

<result>55</result>