A factory is actively carrying out tree planting activities. A total of 315 trees were planted in the first workshop; 42 people in the second workshop planted 8 trees on average. How many trees are planted in the two workshops?
某工厂积极开展植树活动．第一车间共植树315棵；第二车间42人，平均每人植树8棵．两个车间一共植树多少棵？
<gadget id="calculator">42 * 8</gadget>
<output>336</output>

<gadget id="calculator">336 + 315</gadget>
<output>651</output>

<result>651</result>