After watching a classmate start to count the very long line of tens, a problem arose when we started to deal with larger numbers.
Teacher Question? As numbers get larger what would make it easier to group in?
Students - "100's because it is easier to count and if you make a mistake then you don't have to go back and count from 10 again."
On this video clip you can see where we have grouped in 100s using the big chess pieces. We also then used a chair to make a group of 1000.