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I really appreciate the information. I really like your illustration of driving....especially since my oldest just got her permit. 
I might not have been very clear in my original post. I actually have the Lesson books and Worksheet books for levels B, C and D. I have just the Lesson book for Level A. It's copyright is 2001. After the appendices there is a Game Log and then pages called Worksheet 1 Writing Tally Marks, Worksheet 2 Combining Tally Sticks, all the way through Worksheet 28 Finding Equal Lengths, and then ends with the lyrics to Yellow is the Sun and Writing Numbers. So, I'm thinking that these would be the very same worksheets in the new individual worksheet book. So, I wouldn't have to even buy the worksheets. But, I wanted to make sure that these are the same worksheets...or are they different or does the worksheet book have more worksheets than just 28 (does that make sense??)?
I have all the manipulatives except for the geometric solids, geometry reflector, base 10 picture cards, and fraction puzzle (I have one vinyl and 2 plastic fraction charts though), the game cards, the Math Card Game book, the Transition book, Al Abacus (2 of them). So, I'm happy that I'm pretty well all set from Level A through Level D.
I will definitely rethink using this with my 13 year old. Maybe I'll give it another try with him. I appreciate all of your suggestions. If you don't mind taking the time, maybe you could let me know if you think I am all set with the Level A Lesson book I have, which appears to have 28 worksheets in the back. I'm thinking I don't have to buy the workbook (worksheets) for Level A since I must already have them. Is this correct?
Thank you!
Tracy
