Hi, would you like to do some math? We have picture cards that represent ones, tens, hundreds, and thousands. I will be the teacher. Say you have 2,475 and 3,645. When you combine them you have 5 thousands, 10 hundreds, 11 tens, and 10 ones. We can't write the number like that. If one of our sections has a 2 digit number, we have to trade to make it 1 digit. In the above picture we have traded our 10 ones for a ten, making our tens a whopping 12! We need to do some more trading.
Okey, that's good. You traded 10 of your tens for a hundred. Now we have 11 hundreds. Do we need to do moe trading? Yes! You can trade 10 of your hundreds for a thousand leaving you with 6 thousands, 1 hundreds, 2 tens, and zero ones. In other words 6,120. Good Job!
Do you want to play again?
Okey, now you teach me!
The other day, my brother did not want to have anything to do with "trading", but once we explained it slowly and he understood why, he was okey with it. I enjoyed helping, too.
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