There are 16 teams in a city holding a football match for middle school students. If each team plays one game with other teams, how many games are needed in total?
某市举行中学生足球比赛，共有16只队伍，如果每只队伍都和其他队比赛一场，则共需要比赛多少场．
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">16 * (15/2)</gadget>
<output>120</output>

<result>120</result>