Xiao Zhang and the master jointly produced a batch of parts and completed it in 6 days. When completing the task, Xiao Zhang produced 210 and the master produced 252. On average, how many more does the master produce than Xiao Zhang every day? (answer in two ways)
小张和师傅共同生产一批零件，6天完成．完成任务时，小张生产了210个，师傅生产了252个．平均每天师傅比小张多生产了多少个？(用两种方法解答)
<gadget id="calculator">252 / 6</gadget>
<output>42</output>

<gadget id="calculator">210 / 6</gadget>
<output>35</output>

<gadget id="calculator">42 - 35</gadget>
<output>7</output>

<result>7</result>