Students in the class count off. If 7, 17 and 27 have obvious "7", say "over";

When encountering multiples of 7, 14, 2 1, 28, etc. I should say the next number of this number. For example, when it's your turn to 14, say "15". This is the most likely mistake made by the next student of 27, because 27 said "over" and said "27" again.

It's hard to break through 30.

If you are wrong, you can perform a program or introduce yourself.

We play one activity at a time, one that is simple and easy to master.