There are 3 roads from Xiaohua's home to the school, and 4 roads from the school to the park. How many different ways are there to walk from Xiaohua's house to the park through the school?
从小华家到校有3条路，从学校到公园4条路走．从小华家经过学校到公园，有几种不同的走法？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>