Cong Cong has 3 different shirts and 4 different pants, how many different matching methods does she have?
聪聪有3件不同的衬衫，4条不同的裤子，她一共有多少种不同的搭配方法．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>