Applying The 5 Basic Concepts to algebra and algebraic story problems. Increasing problem solving skills by using concept based teaching, not algorithms which become meaningless and are easily forgotten.
Again although it is presented with clarity that makes it child's play, the student was a teenager in his junior year of highschool...you can easily see how 7 and 8 year olds on down to 5 and 6 year olds can do these kinds of problems if given enough time and examples to play with...
"Almost all creativity involves purposeful play." ~Abraham Maslow American psychologist 1908-1970
"Whoever wants to understand much must play much." ~Gottfried Benn German physician 1886-1956
"Play gives children a chance to practice what they are learning." ~Fred Rogers American television personality 1928-2003
"People tend to forget that play is serious." ~David Hockney Contemporary British painter
"Do not…keep children to their studies by compulsion but by play." ~Plato Greek philosopher 427-347 BCE
"Necessity may be the mother of invention, but play is certainly the father." ~Roger von Oech Contemporary American creativity guru
Crewton Ramone's House of Math