Essentially learning is emotional as well as cognitive. When you bring in the emotionally friendly zone in teaching, each child has a chance to grow to his or her best in the subject area. I believe.
Angle sum of a polygon
Why is the formula for angle sum property of a polygon (n-2) x 180? This is what the students investigated by cutting a set of different polygons into triangles and arriving at a conclusion with their group! They had a clear task sheet for the work. They hummed, sang and chatted their way to the discovery. Even the most disinterested in Maths joined in --- eventually.