Everyone is divided into two groups ~ ask each other questions casually, the main topic is math, and you can't ask questions that go wrong!

You can set rules:

1, divided into two groups or four groups for the elimination system, each two groups against each other.

2. The topic has been given priority to with math problems, which can't exceed this semester's courses.

3. The topic can be quick calculation, equation or geometry.

4. The answer must be completed within 2 minutes, and the whole group can cooperate without using a calculator. If you can't answer for more than 2 minutes,

5, 2 groups of people take turns to give each other questions, up to 5 questions.

And then ... it's over. The teacher came to explain the problems encountered in the process.