The sixth grade held a table tennis competition, a total of 10 students participated. If there is a game between every two students, how many games will there be in total?
六年级举行乒乓球比赛，共有10名同学参加．如果每两名同学之间都进行一场比赛，一共要比赛多少场．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">10 * (9/2)</gadget>
<output>45</output>

<result>45</result>