During the Arbor Day this year, the sixth grade students of Shapo Town Central Primary School planted 252 trees, 48 more than the fifth grade students. How many trees are planted in two grades?
今年植树节期间，沙坡镇中心小学六年级学生共植树252棵，比五年级同学多植48棵．两个年级共植树多少棵？
<gadget id="calculator">252 - 48</gadget>
<output>204</output>

<gadget id="calculator">204 + 252</gadget>
<output>456</output>

<result>456</result>