You are correct, except for the fact that the government school text books are rubbish.
In the case that your child is being taught the color of math, no amount of parental involvement will help. Other than removing the child from government schools, that is.
I got a look at the 9th grade textbook the kids in this district are allegedly using (I say that because I’ve heard the teacher rarely refers to it).
The text is chock a lock full of politically correct colored pictures of racially balanced groups of kids smiling while doing meaningless hands on activities using manipulatives. There are white males pictured but they are either in the background or wheelchairs.
The first lesson was on how to make numbers using sign language- in ninth grade.....
This was in a book that was supposed to be geared for kids doing algebra. The book was very difficult to read: the lessons were not well explained and the problem sets were difficult to identify.
After having used Saxon Math for so many years, I could easily see why public school kids are so far behind homeschooled kids in math ability.