If your child is subject to timed drills, this is the perfect practice book. I tried the on-line ones, but they were either too short, too easy, not well-balanced in terms of problems or whatever. This book has drills organized by number (-1, -2, etc.), by groupings of numbers, up to the ones that go through all numbers that are found on these tests. They have really helped my daughter prepare for her timed drills at school.
The only downside is that I wish there were more pages. Other than that, this is a great product.
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