Category: Make & Grow
Multiplication: A parlor finger trick
Click numbers on the left and on the right to set up an example: This Flash applet teaches you how to compute times tables from 6 to 10, on your fingers. The trick was first recorded around 15th century, when…
Posted in Grow
Inspired by Calculus Math Circle – Week 4
Even if five-year-olds can play with advanced ideas, can they do the next steps toward formal math? Can they actually integrate and differentiate? Are they capable of sufficient level of abstract thinking? These are the questions we are focusing on…
Posted in Grow
Semiotic Square: Easy-Complex-Simple-Hard
Tweet The semiotic square is a tool used for the structural analysis of relationships, developed by linguist Algirdas Greimas. We’re going to relate four different concepts in three different ways. First we want to rule out the incompatibilities. The diagonal…
Posted in Make
Math Mind Hack: imagine replacing one object with another
Tweet Asking “What if?..” always opens up mathematical possibilities. But this hack is about scale analysis, ratio and proportion, and other spatial reasoning skills. Yet it also helps with general problem-solving and imagination. Photo sources: the skies; the hands; eye/mouth. It’s a remake…
Posted in Grow
