Turning 2D into 3D

Teacher to complete example. I have lost 5 teeth. If I get $1 for each tooth, how much do I{...}

I Do: Begin a discussion about what is ‘half’ with the viewing of  Investigating half of familiar objects.  Discuss with{...}

I can regroup numbers when I have 10 of a unit (for example, 10 ones makes 1 ten, and 10{...}