You have my admiration for recognizing that your children were missing a major part of their basic education and taking steps to correct it. ( Very expensive and a great sacrifice on your part.)
Like BobL, I didn't trust the teachers in the government schools and from interviewing principals and teachers in private schools I concluded they were dittzes, too! From the time they were babies I worked on phonics and letter recognition, and counting. They were **years** ahead of their contemporaries. Two finished B.S. degrees in mathematics at the age of 18.
Parents, like you, yldstrk and BobL, are to be commended for recognizing the **you** are the ones who must stand before God and be judged for how well you prepared your children for life.
By the way....I think every government teacher should be immediately given the GED. If they fail, they should be fired. Most would fail the math section. And....I think every government teacher should be required to take and pass with a “B” Calculus I ( the **same** courses as the engineers, science, and math majors) . No, most don't need calculus for what they do, but it would assure that: 1_) they had a high enough IQ to deserve the job, and 1) that they wouldn't be passing on their math phobia to their students.
I once dated a high school math teacher (She had a Math Ed degree!) who never had Calculus. I remember thinking to myself how can she have a “Math degree” and not have had Calculus! That was before I found out that there are shall we say “degrees of of degrees”!
As a history teacher, I’d be thrilled if I had to pass a GED including the math portion. Got a 1540 on my SATs - 800 verbal and 740 math. :D
And yes, I also have Calculus I, as well as Calculus II and III, Linear Algebra, differential equations, etc.