Each student needs 8 exercise books. There are 53 students in Class 4 1 and 47 students in Class 4 2. How many exercise books do these two classes need?
每个同学要用8本练习本，四1班有53个同学，四2班有47个同学，这两个班一共需要多少本练习本？
<gadget id="calculator">53 + 47</gadget>
<output>100</output>

<gadget id="calculator">8 * 100</gadget>
<output>800</output>

<result>800</result>