1*24=23
2*12=10
3*8=5
4*6=2
I remember taking some college night classes and at one point we were doing quadratic equations. A lot of the students were using tutors because the class was very progressive and spent little time on any one topic. While doing homework one night, my wife called me to the TV and there was a class doing the same exact equations on a PBS station. It was an 8th grade class.
The instructor was involved in the jettisoning of human waste at NASA way back when.