What a truly horrible, convoluted way of approaching math. Without the core basics and understanding of 2+2=4, et al, you lose the foundation of math itself. The example used takes twice as long to solve the problem. It reminds me of the old joke: “How many people does it take to screw in a light bulb?” The answer: “Three. One to hold the light bulb, two to turn the ladder.” Math and math theory are based on solid foundations, and yes, a certain amount of memorization. EVERYTHING in learning requires memorization of some sort, until it becomes second nature. From that point, you can build abstracts. I went from a failing math student in 9th grade to an honors math student in 12th. Why? Because I had a consistently good teacher throughout those years, and it had nothing to do with the Common Core type of approach.