I can see that four may seem like lots at times!

The problem with math is that it isn't a question of what each has masterd but that DS is so far beyond in ability. It's the difference between inherently understanding math without any teaching and learning easily with instruction. Perhaps I have been part of the problem because at times I have been unable to hide my exasperation if I need to explain anything and she could see that DS just knows without instruction or with a passsing 5 second comment.