I purchased this book and a few others to teach my son non traditional math.  He was doing horribly in math at school, not because he couldn't do it, but because he was bored to tears.  I started teaching him the math concepts in this book, he's in 4th grade, and he will do his math assignment without complaining which is so refreshing.<br><br>I marked the review down 1 star because I didn't like how the chapters were laid out.  The authors mix fractions into the division chapter and just seem to skip around more than I like.<br><br>I pulled the great information I liked out of the book and have recommended it to friends because this book has some techniques that are easier to follow than I found in other books.