The school bought a batch of chalk, 36 boxes per box, and the school bought 12 boxes and 20 boxes. How many boxes of these chalks are there?
学校购进一批粉笔，每箱36盒，学校买了12箱零20盒．这些粉笔一共有多少盒？
<gadget id="calculator">36 * 12</gadget>
<output>432</output>

<gadget id="calculator">432 + 20</gadget>
<output>452</output>

<result>452</result>