I have brought those ideas back into the classroom. They are learning to control the numbers instead of the numbers controlling them. They are the masters of numbers.
Doing this, we go back to using expanded form. We need to keep those numbers true to their value. We have spent a couple classes playing with this. Now to see if they were paying attention. In class today I have given them 639x82 = 52398. I have challenged them to prove it 10 ways. They have started with their table groups. Now they have to take it home on their own. We'll see what they come up with. I will post my 10 ways too.
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