There are 45 students in Class 5 and 4 of Yuxing Primary School. In the physical fitness test in 2017, 40 students reached the "Shenzhen Physical Exercise Standards". What percentage of the class did not meet the standards? (expressed in simplified form)
育星小学五4班有学生45人，在2017年的体质测试中有40人达到《深圳市体育锻炼标准》，未达标的同学占全班人数的几分之几？(用最简分数表示)
<gadget id="calculator">45 - 40</gadget>
<output>5</output>

<gadget id="calculator">5 / 45</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>