Choose around 10 volunteers to come and stand in a line at the front of the classroom. The first student in line must begin counting from 1, and each student in turn calls out the next number. However, every 4th number must be replaced by the word "beep" (or buzz etc.). Following a "beep" the next student in line must call out the next number, and not the number that has been replaced. For example, 1, 2, 3, beep, 5, 6, 7, beep, 9 etc.
If a student hesitates too much or makes a mistake he/she must sit down, so eventually only one student remains. Whenever a student sits down, begin from 1 again. See how far you can get!
Submitted by: Caroline Berry