tmstranger,
The ladies are doing a terrific job of talking through possibilities with you. It helps so much to have a wealth of expertise and information at your fingertips like this board provides.
I am glad that you will get a chance to use HOD with your son this coming year. We pray it will be a blessing to your family!
In looking at math and the questions that you've shared thus far, I wanted to pop in to weigh in with a few things to think about.
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Having done Foerster's Algebra I last year with my own very mathy child as a freshman, I can honestly say that I would never recommend using Foerster's Algebra below 8th grade. The rigor of the problem sets, along with the maturity needed to think deeply about the topics presented within the coursework make it an honors level high school math course - not an early middle school math course, even for academically strong naturally math-minded kiddos. The Foerster text has been selected as the text for the AP Exam in high school Algebra in the past more than once. Plus, it is important to remember that there are other better ways to stretch and encourage a mathy student than picking a super rigorous math text that is years ahead of their maturity level.
With this in mind, you have several excellent options that have been shared by the ladies in this thread to consider. You could potentially continue with Saxon, since this is something with which your son is familiar. Or, you could instead do a basic no-frills introduction to Algebra through No-Nonsense Algebra and supplement with outside things in the problem-solving area to stretch him further mathematically. This could be very enjoyable as there are many wonderful math resources that you could add to get him really thinking mathematically.
Or, you could ponder doing Singapore Primary math, giving him the placement test for the U.S. Edition to see where he would fit best, being sure not to interpret any questions on the test for him but just letting him test away to see where he fits. It would not be uncommon for even a mathy child to have to begin back a bit in Singapore math, simply due to a differing scope and sequence and different way of thinking and solving problems. If he's a mathy kid he may really thrive on the unique Singapore method, the mental math, and the interesting way of solving problems. If you did want to just see where he might have to enter the program, you could begin with the 4A test and if he passes go on to 4B and so on until he no longer passes easily. The Singapore primary math series ends at 6A/6B (which in Singapore equates to the end of 7th grade).
Singapore is a totally different math program than Saxon. There is a huge difference in the number and kind of daily problems. Singapore takes much less time to complete each day, but includes more difficult multi-step problem sets incorporating review within the problems instead of as a separate daily component. Your math time would be much shorter with Singapore, but we find the time to be completely engaged time that lingers after the lesson is over. So, this may be an option for you to consider. If your son did test out of 6B, there is a 7th and 8th grade level different Singapore series you could consider. The series at that level differs from the previous Singapore series in style, presentation, and content. However, if you are new to Singapore math anyway, and your child excels at math, it may work for you. I would likely consider other options though, before placing my child in the 7th or 8th level of the Singapore series. Link here to placement test:
http://www.singaporemath.com/Placement_Test_s/86.htm
Another option would be to begin VideoText Algebra Module A and Module B, stretching them out over the year, or going at your son's pace. The VideoText program can be used successfully with younger kiddos at a slower pace over multiple years so that may be a good option as well. My oldest son did this program and enjoyed it!
Foerster really builds one lesson incrementally upon the other and would be best if moved through in one year's time to fully grasp the presentation and concepts.
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This is why the other math options would be better for your son's age and maturity level even with his strong abilities in math.
Anyway, I pray the Lord will give you peace as you ponder your options. With a 6th grader who has many years of math to go, there are more things to explore than Algebra. And, if you do go the Algebra route it will need to be with a program that takes the maturity of your student into account.
Blessings,
Carrie