My parents had trouble with the *new* math when I was in grade school in the mid-60’s.
Saxon Math curriculum is the absolute best going.
Teach your kids real math and they will succeed.
I have a couple of friends that home schooled their son.
They spoke very highly of the Saxon Math program.
There are also some great lectures and videos on youtube and of course Kahn Academy.
I got the Saxon Math Algebra 1/2 when it was a Conservative Book Club selection in the ̣90s then compared it with the local HS Algebra book. I realized quickly that I could use the Saxon to teach myself Algebra. With the Public School book that was impossible. Several local schools started using Saxon then quit when the Teachers’ Union objected because it seemed to cut the teacher out of the loop. The regular algebra books required a teacher to explain the bs on the page.