One particular one that I see which seems so...fixable is that her tiny handwriting is not "straight" and numbers end up drifting around such that she adds carried digits to the wrong columns or whatever. This is in addition to your classic 7/1/4 mix-ups due to messy/tiny numbers. This math teacher had them using graph paper for scratch work at the beginning of the year, for just this reason. Wonder if I should see if she wants to use it for tests....