We have been busy working through our new math books from Math-u-See. This week K-man was working on adding and estimating numbers in the hundreds. He is also working on understanding the concept of carrying numbers from one place value to another. We got talking about BIG numbers and he decided he wanted to try adding bigger numbers. We LOVE Math-u-See, it makes math concepts so easy to understand and teach to your children. I don't see us using any other math program.