The school purchased 800 books and prepared to distribute them to each class, with 48 books distributed to each class. There are 13 teaching classes in the school. How many books have been reduced after the distribution?
学校购买了800册图书准备发给各班，每班发48册．学校一共有13个教学班，发完后学校图书减少了多少册？
<gadget id="calculator">48 * 13</gadget>
<output>624</output>

<result>624</result>