Some paper cranes are needed to decorate the classroom, 12 in each string, 12 strings are needed, how many paper cranes are needed in total?
布置教室需要一些纸鹤，每串12只，需要12串，一共需要多少只纸鹤？
<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>