Last week I was observing in a 2nd grade classroom that was doing work with a Hundreds Chart. The teacher did a fabulous activity she called the Number Path Challenge. The kids could start on any number but they had to find three different paths to the number 38. The first path had to be using only addition to reach 38, the second path was only subtraction, and the third path was using both addition and subtraction. That was a fun activity for them on its own, but we added some extra incentive because if we saw a good path, the kids got to come back to a table with me and explain their path using my iPad. You can check out those videos, along with explanation of the app I used, at my other blog. But here is a photo of what it looked like:
2.NBT.5, 2.NBT.6, 2.NBT.8