I've got an interview next week, and I've got to teach an hours maths lesson to a year 5/6 class. They've finished their current unit, and Y6 have just done their SATs, so I can choose any area of maths I like. Big problem is it's a mixed ability class with everything for level 1 - level 5 in there. I was thinking problem solving or investigation of some sort but would appreciate any help. Where should I get my objective from and my I cans and what about differentiation?