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?
