Teachers, please help!

[LaBelleDameSansPatience]

On Monday I have an observed maths lesson. It must be Using and Applying/problem solving for a mixed age class of y5/6, ranging in ability from Level 2A to 5B. (My maths ability is probably about 4B!) Our topic this term is Ancient Greece or, of course, Easter.
I have no idea what to do or how to structure it.
Any ideas?

Ancient greece means geometry. something about finding largest area for a set perimeter?

can't you do a huge problem solving thing about chicken/egg
no I don't mean the old debate, thinking give them values and finding our how many eggs you can get ..... well I know I'm mad but I like learning to be fun. There's a game called eggs to order" which is straightforward number ordering (but not in sequence) for low ability/SEN.

Mnis, have done the perimeter thing; since it is nearly the end of term I have done a lot of geometry.

I am thinking of investigating chickens and eggs! Will look up 'eggs to order'.