There are 440 students graduating from the sixth grade in Hongqi Primary School this year, which is 10% more than last year. How many students graduated from the sixth grade last year?
红旗小学今年六年级毕业学生人数有440人，比去年多了10%，去年六年级毕业学生人数有多少人？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">440 / (11/10)</gadget>
<output>400</output>

<result>400</result>