The school is going to distribute exercise books to 12 classes, each class has 206 copies, and needs to keep 384 copies as spares. How many exercise books should the school buy?
学校准备发练习本，发给12个班，每班206本，还需要留384本作为备用，学校应买多少本练习本？
<gadget id="calculator">206 * 12</gadget>
<output>2_472</output>

<gadget id="calculator">2_472 + 384</gadget>
<output>2_856</output>

<result>2_856</result>