There are 9 homework books for each student. There are 46 students in Class 4 1 and 44 students in Class 4 2. How many homework books are needed in total?
每个同学发9个作业本，四1班有46人，四2班有44人，一共需要多少个作业本？
<gadget id="calculator">46 + 44</gadget>
<output>90</output>

<gadget id="calculator">9 * 90</gadget>
<output>810</output>

<result>810</result>