I ordered this book after reading about JUMP math in a New York Times article. I loved the premise that anyone can be good at math, and that math makes more sense if it is broken down into teeny tiny steps. I struggled A LOT with math in 3rd, 4th, and 5th grades. Eventually I managed to become reasonably good at math and managed to take number theory in college. That semester made me furious -- I couldn't believe how much my teachers had left out! I think they truly didn't the math they were teaching in any meaningful way. I purchased this to use with a student who is almost finished with second grade.We haven't used this entire book yet, but I've gone through the lengthy introduction and I think the section on "mental math" is worth the purchase price. It has all kinds of tips and tricks for adding, subtraction, and multiplication facts (as well as two and three digit addition and subtraction) that I wish someone had mentioned to me in elementary school. They're not rocket science, but I'm guessing I'm not the only person who never figured them out by myself.I think the information for this book online isn't terribly clear. This book doesn't assume that the student is being taught JUMP math at school. It provides a short section for each micro-skill, and the section in the book is supposed to be the test to verify that the student has mastered the skill. The parent is supposed to provide some practice problems and go over the skill before the student completes the worksheet. I think most parents would find this fairly easy to do, because the skills are broken down into very small steps. The key thing they're providing is the division of all these tiny skills. I don't know anywhere else to go to find things broken down like this, and I think it is very valuable. A lot of these skills may be pretty much instant for a lot of students, in which case you don't need to prepare much before doing the worksheet.I think this book fits pretty well with the 2nd grade standards for California, and it includes some that are 3rd grade standards. I think this book would be useful for students who are doing well in math and students who are struggling. There is a lot of work for addition and subtraction, with 1 and 2 digits. While my student had "mastered" addition and subtraction, she's actually learning a lot by learning these skills again. There is also a section on making change, introductions to multiplication and division and fractions.