There are 150 math exercise books in each bundle, and Yucai Primary School ordered 30 bundles for the fourth grade, how many books in total?
每捆数学练习本有150本，育才小学为四年级订了30捆，一共订了多少本？
<gadget id="calculator">150 * 30</gadget>
<output>4_500</output>

<result>4_500</result>