Click numbers on the left and on the right to set up an example: [swf src=”https://naturalmath.com/s/wp-content/uploads/2014/04/69trick_2new_2.swf” width=400 height=400] 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 merchants collected techniques called finger reckoning to calculate their profits. Back […]
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 as our “Inspired by Calculus” local math circles for 7-11 year olds are getting closer […]
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 lines represent a contradictory relationship. Easy and hard live on opposite ends of one spectrum, […]
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 of my more general mini-poster. I like this version better, because it has clearer visual […]
