There's actually decades of research on how to more effectively teach math, including the effectiveness of inquiry based learning approaches, which are more effective.

See the MAA's Instructional Practices Guide: https://www.maa.org/programs-and-communities/curriculum%20re...

Here's info on research on the effectiveness of inquiry learning in math: https://theconversation.com/who-learns-in-maths-classes-depe... https://www.colorado.edu/eer/research-areas/student-centered...