Thank you so much for your answers. We are having so much fun with these books. I, too, have seen improvements in critical thinking since we started. My help is more of guiding her to continue to try and not give up after one try. Going through it again is a great idea. We bought a few books of logic puzzles, the kind with a grid and a few clues to figure out who did what and where, we have gone through those puzzles two times and some of them three times. I did not worry about those. Math is just the medium is a good mantra. I will not stress anymore.