In today's lesson we are going to work on solving addition problems with regrouping ... Now that's a two digit number. So I write down my zero and I regroup my one. I now am in my thousands ...

Column addition is a way of adding numbers together. It's helpful when you're adding two-digit or three-digit ... 3 tens + 2 tens + 1 ten (from the regrouping) = 6 tens Image caption, That is ...