There are 6 classes in the third and fourth grades of Dongfang Primary School. There are 45 students in each class of the third grade, and 48 students in each class of the fourth grade. How many more students are there in fourth grade than in third grade?
东方小学三、四年级各有6个班．三年级每个班45人，四年级每个班48人．四年级比三年级多多少人？
<gadget id="calculator">48 * 6</gadget>
<output>288</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">288 - 270</gadget>
<output>18</output>

<result>18</result>