Hey Ruth,
That’s a great question! Generally speaking, curriculum that is geared towards gifted students will most likely teach this style of math. Don’t worry if your children are not gifted, though you may need to use a grade level below where your student is at. Grade levels don’t matter anyway, right?
As a classroom teacher I used Investigations in elementary and Connected Math in middle school. Both of those curriculums are probably in a university library if you live close to one. If they are, you could check them out for a month or two without buying them.
I have less experience with homeschool curriculum as I normally just make my own 🙂 Beast Academy (from The Art of Problem Solving) looks really good and might be what we end up using this upcoming year now that my son is in 3rd grade.
If you want to compile your own curriculum, looking for STEAM or STEM activities is a great place to start!
Hope that helps!