Wangcun Primary School held a mathematics competition with a total of 10 questions. 10 points are awarded for each correct answer, and 2 points are deducted for each incorrect answer. Xiao Ming scored 64 points. How many questions did he get wrong?
王村小学举行数学竞赛，共10道题．每做对一道题得10分，每做错一道题扣减2分．小明得了64分．他做错了几道题？
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">100 - 64</gadget>
<output>36</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<result>3</result>