There are 5 classes in the fourth grade, with an average of 42 students in each class; there are 6 classes in the sixth grade, with an average of 38 students in each class. How many students are there in the two grades?
四年级有5个班，平均每班有42人；六年级有6个班，平均每班有38人，两个年级一共有多少人？
<gadget id="calculator">42 * 5</gadget>
<output>210</output>

<gadget id="calculator">38 * 6</gadget>
<output>228</output>

<gadget id="calculator">210 + 228</gadget>
<output>438</output>

<result>438</result>