In the sixth grade, there are 10 table tennis players competing. It is stipulated that every two players will have a match, and how many games will be played in total.
六年级有10名乒乓球队员进行比赛，规定每两个队员之间都要比赛一场，一共要比赛多少场．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<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>