There are 270 students in the fourth grade of Hongzhuan Road Primary School, with an average of 45 students in each class. How many classes are there in the fourth grade of this elementary school?
红专路小学四年级共有270名学生，平均每班有45名，这所小学的四年级共有多少个班？
<gadget id="calculator">270 / 45</gadget>
<output>6</output>

<result>6</result>