A certain school has 225 students in the third grade and 281 students in the fourth grade. How many more students are there in fourth grade than in third grade?
某校三年级有学生225人，四年级有学生281人．四年级比三年级多多少人？
<gadget id="calculator">281 - 225</gadget>
<output>56</output>

<result>56</result>