Oh, yes! We can sympathize here. DD actually makes a lot of mistakes in math. In her case, I chalk it up to complete disinterest. She just can't be bothered to try to do a good job on questions that are 'too easy' for her. It really is a Catch-22 because her teacher wants to see that she can do the work so that she can move her forward to harder things. If we can engage her verbally, it is amazing the answers she can pull out of the air. But give her a pencil and she shuts down.

Tomorrow is always fresh, with no mistakes in it. — L.M. Montgomery