The school held a basketball game. Eight classes in the whole grade met face to face. How many games did they play in total?
学校举行篮球比赛，全年级8个班级，对对见面，一共打多少场．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<result>28</result>