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I love, love, love this series - I wish I could find the whole set!
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Excellent curriculum for true understanding of math. I wish I had known about this for my own children, but at that time the U.S edition was just being introduced. I have used this for 2 1/2 years as a nanny/homeschool helper and was impressed with how it helps the kids to truly understand what they are doing rather than just doing a random math fact. The more I study this, the more I realize that this is an incredible tool for kids to get an excellent foundation. I'm looking forward to using this more this coming fall as I teach in a Classical school.