Max worked on subtracting two digit numbers with borrowing when necessary. I wanted to see what he knew so I gave him a sample problem and he immediately began to "borrow" from the next tens place but it wasn't necessary, so we backtracked and went through the process of when and why. He made tremendous gains with this concept and felt satisfied once he got the hang of it. By the end of the lesson, he was able to subtract triple digit numbers with borrowing as suggested on the list provided.