I was hoping you could help me out with a question about a demo lesson. I am presenting two different demo lessons in the same school one for first and one for second grade. They both involve math topics and I wanted to divide kids into groups for at least one of the lessons. I was wondering if it would be wrong to have the same format for both lessons. I was thinking of doing a 10-15 minute intro, 20 minute group work and 10 minute closure. Thanks!