Xiaohu walked 1.3 kilometers from home to school in the morning. After walking 0.3 kilometers, he found that he did not bring his math homework book, so he went home to get it. How many kilometers did he walk to school this time?
小虎早上从家到学校上学，要走1.3千米，他走了0.3千米后发现没有带数学作业本，又回家去取．他这次上学一共走了多少千米？
<gadget id="calculator">0.3 * 2</gadget>
<output>0.6</output>

<gadget id="calculator">1.3 + 0.6</gadget>
<output>1.9</output>

<result>1.9</result>