The students proposed to donate 400 books to the "Hand in Hand" school. Grades 1 to 6 each donated 58 books, how many more books will be donated to reach 400?
同学们倡议捐400本图书给"手拉手"学校．一至六年级各捐了58本，还要捐多少本就达到了400本？
<gadget id="calculator">58 * 6</gadget>
<output>348</output>

<gadget id="calculator">400 - 348</gadget>
<output>52</output>

<result>52</result>