There are 8 classes in the third grade of Guangming Primary School, and each class has 8 study groups. Now there are 640 extracurricular books to be divided into study groups. How many books can each group get on average?
光明小学三年级有8个班，每个班有8个学习小组，现在有640本课外书要分到学习小组中，平均每个小组能分到几本？
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">640 / 64</gadget>
<output>10</output>

<result>10</result>