Dad has 3 ties of different colors and 4 shirts of different styles. Wearing a shirt and wearing a tie, how many matching methods are there?
爸爸有3条不同颜色的领带和4件不同款式的衬衫．穿一件衬衫，打一条领带，一共有多少种选配方法．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>