The students went to plant trees. There were 210 students in the fifth grade, and each of them planted 2 trees. There were 180 students in the sixth grade, and each of them planted 3 trees. How many trees were planted in total?
同学们去植树，五年级有210人，每人植2棵，六年级有180人，每人植3棵．一共植树多少棵？
<gadget id="calculator">210 * 2</gadget>
<output>420</output>

<gadget id="calculator">180 * 3</gadget>
<output>540</output>

<gadget id="calculator">420 + 540</gadget>
<output>960</output>

<result>960</result>