Erik has been struggling to grasp the concept of place value, so we've been trying to find ways to make it more understandable. His school was doing a coin-wars fundraiser, so we pulled out our coin jar and I set him to work counting sorting them out.
We did this same process with each of the different types of coins. I think by the time we were done he had a much better understanding of place value, though he still doesn't quite have it mastered. We'll keep working on it, but we're almost there.