Xiaoling participates in the math competition, the total number of questions in the whole paper is 36, and Xiaoling only does the correct number of questions (8/9). How many questions did Xiao Ling do wrong?
小玲参加数学竞赛，全卷总题数是36题，小玲只做对总题数的(8/9)．小玲做错了多少题？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 - (8/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">36 * (1/9)</gadget>
<output>4</output>

<result>4</result>