The second class of the third grade used folded paper cranes to decorate the classroom, 12 in each string, and 12 strings were used to decorate the classroom. How many cranes should be folded in total?
三年级二班用折叠的纸鹤装饰教室，每串12只，布置教室要用12串，一共需要折多少只？
<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>