A piece of eraser costs 2 yuan, Xiaoxiao bought 3 yuan, she paid the salesperson 10 yuan, how much should she get back.
一块橡皮2元钱，笑笑买了3块，她付给售货员10元钱，应找回多少元．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<result>4</result>