Pre-Calculus Workbook For Dummies

I purchased this book to refresh myself on a subject I hadn't touched in over 10 years. I haven't made it through Chapter 1: Beginning at the Very Beginning: Pre-Pre-Calculus. I'm working on the practice exercises and am up to Problem #7 of 10 on Page 11. ***PAGE 11!!!*** I spent well over an hour trying to figure out what I did wrong on Problem #4 only to discover by chance that the problem was written wrong. I wrote in the correction by hand for future reference. I checked my work on #7 with the answer/explanation section. Though I got the right answer, my method appeared wrong. I spent another half hour or so going step-by-step checking for any possible errors I may have made until I discovered it was yet another error. I also wrote in that correction by hand. Sometimes there are typos and minor flaws with which you can get away in the publishing industry. But for a math book, a typo involving numbers and orders of operations makes a HUGE difference when trying to learn the content. I have no idea how many of these flaws there are, but from what I've gotten to so far (only the first 7 problems mind you), 28% of the material I've reviewed has mistakes. That statistic will go up or down the further I get into the book but at least I know how to divide correctly, which is more than I can say about the people who put this book together. I DO NOT recommend this book!