The experimental primary school distributes homework books, 146 books per class, and there are 33 classes. The school still needs to keep 40 books as spares. How many homework books do we need to buy in total?
实验小学发作业本，每班发146本，有33个班，学校还需要留40本备用，共要买多少本作业本？
<gadget id="calculator">146 * 33</gadget>
<output>4_818</output>

<gadget id="calculator">4_818 + 40</gadget>
<output>4_858</output>

<result>4_858</result>