We have this book and I love it! I'm doing some of the activities with my 3 year-old. I use it just as a big list of ideas, but they also offer a chart suggesting how to use it as a 40 or 50 week curriculum for different age groups. It's organized according to the following chapters:
1. Free Exploration
2. Spatial Relationships
3. Classification
4. Patterning
5. One-to-one correspondence
6. Ordering
7. Numeration 1-5
8. Shapes
9. Numeration 6-10
10. Fractions
11. Measurement
12. Time
What I like most is that there is a ton of ideas (40-60 per chapter) and you can understand very well how certain activities relate to the bigger "math" picture. For instance at the beginning of each chapter they have a page giving the following: Definition, Bridge to Other Math Concepts, Suggestions for Success, and Key Words. Then at the end of each chapter they have a list of additional resources, ways to incorporate the concepts in daily life, and ideas at home (the book seems somewhat geared towards teachers, but almost all of the ideas are easy to implement by homeschoolers).
Some of the ideas they give are super basic and obvious, some are really unique and cool but the book is so chock-full that even with the basic ideas its a great resources for when you're feeling "stuck." Kind of like the "Preschooler Busy Book" but with all mathy ideas and with each idea placed in context of teaching a particular concept.
We really love it and I think its very age appropriate and fun.
