There are 180 students in the 4 classes of the sixth grade, and 102 students in the 3 classes of the first grade. How many fewer students are there in the first grade than in the sixth grade?
六年级4个班共有学生180人，一年级3个班共有学生102人，一年级比六年级平均每班少多少人？
<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<gadget id="calculator">102 / 3</gadget>
<output>34</output>

<gadget id="calculator">45 - 34</gadget>
<output>11</output>

<result>11</result>