There are 32 classes in Dongdajie Primary School, and each class donates 145 books for the Hope Project on average. How many books are donated by the whole school for the Hope Project?
东大街小学有32个班，平均每班为希望工程捐书145本，全校为希望工程捐书多少本？
<gadget id="calculator">145 * 32</gadget>
<output>4_640</output>

<result>4_640</result>