Xiao Ming took five homework tests. When the mathematics results were not announced, the average score of the other four homework was 90 points. After the mathematics results were announced, the average score of the five subjects was 92 points. What is his math score?
小明考了五门功课，数学成绩没公布时，其它四门功课平均成绩是90分．数学成绩公布后，五门功课平均成绩是92分．他的数学成绩是多少分？
<gadget id="calculator">92 * 5</gadget>
<output>460</output>

<gadget id="calculator">90 * 4</gadget>
<output>360</output>

<gadget id="calculator">460 - 360</gadget>
<output>100</output>

<result>100</result>