Xiao Ming's home is 650 meters away from the school. One morning, when he walked 200 meters from home to school, he found that he had forgotten his math books at home. So he went home to get the book again, and went to school after getting the book. How many meters did Xiao Ming walk to school this morning?
小明家离学校650米，一天早晨，他从家去学校，走了200米的路程时，发现数学书忘在家了．于是他又回家拿书，拿到书后再去学校．这天早晨，小明上学一共走了多少米？
<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">650 + 400</gadget>
<output>1_050</output>

<result>1_050</result>