Group sizes can be from 10 - 100 or more.

I can accommodate large numbers if you want to have several classes at the session.

Talking to one large group is some times easier than talking several times during a day to different groups.

If the grade range of the students varies considerably then separate talks are recommended.

If you require individual talks to different classes throughout the day, arranging for me to remain in one room for the entire day works best. Due to the equipment used, moving from classroom to classroom after each presentation does not work.