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DO NOT buy the kindle version of this on Amazon. The pages are CUT OFF and you cannot see the end of an equation or a table for example. Amazon should not be selling these books incomplete. They should offer full refunds.
I'm really upset with the kindle edition of this book. A lot of mistakes in it, and the errata published on their website is really messy to use with the electronic edition of the book (I'm using the kindle app on my ipad). And why should we use an errata with an electronic edition of a book, in the first place ? An extra 1/5 an hour spent by someone anyway compiling the mistakes for the web errata on actually making the corrections in the electronic edition of the book seems like a logic and decent thing to do ... Apparently not. Because of this approach I give the lowest possible rating to the book . It seems like a rip off. It's really annoying spending 1/2 an hour to sort out a math problem and then discover, after another 1/2 an hour of trying to figure out what from the errata goes where on the messy page system of the kindle edition, that somebody made you pay for yet another gratuitously sloppy product.
This is hardly helpful, unless you have forgotten everything about math. It teaches you to add, and plot points on a coordinate plane. To be fair, it does go through PEMDAS and finding the LCM which can be helpful for some, but I don't think such basic but important concepts are worth buying this book for.