I was able to review Looking At Lines $24.95, a hands on math concept book from Aims. Aims is a non for profit educational foundation. They provide hands on math and science activities for kids of all ages.
Looking At Lines is a book that focuses solely on graphing and linear functions for grades 6-9. I used this with both my 5th grader and 7th grader. My 5th grader is just learning the basics of linear functions and graphing, so we just did a few activities until she caught on. My 7th grader has been struggling with the linear functions this year. He learns much better hands on, and hands on math seems harder to fine. These books are great and affordable.
Here is an example of an elevator we made. She graphed where the counterweight was according to where the passenger car was. The building had 7 floors, so she was able to figure out that X(the counterweight) plus Y(the car) equaled 7. This was a very basic concept and helped her to fully understand what the graph and the equation has to do with each other.
The activities do get more complicated as the book goes on.
I feel like the book may have more activities than I could possibly use with my kids. However there is such a selection of activities that I am able to pick which one would work best for our learning at the time.
For $24.95 you get the book and a cd-rom with the worksheets on it so you can print them out for multiple students (up to 200).
Try an activity out of Looking at Lines here. It is a really neat one, where you graph the bounce of a ball.
You can sign up for their email and down at the bottom of this page there are also access to many free hands on activities.
Aims offers many hands on activity books check them out!
Disclosure: As a member of The Old Schoolhouse Homeschool Crew I review products like this, which I receive for free in order to be able to share my honest opinion.