Archive for the ‘Trick’ Category
Friday, February 1st, 2008
9 is a most interesting number. I'm sure that's largely because 9 is 1 less than 10 and most of us have 10 fingers (or digits) and we do arithmetic in a base 10 system. I've seen an amazing number of math tricks that take advantage of something called ...
Posted in Trick, Fun, Algebra | 5 Comments »
Wednesday, January 30th, 2008
Last month I blogged about mathemagician Arthur Benjamin and his amazing mental Math feats. Benjamin is a master of doing arithmetic in his head with lots of digits involved. In particular, he's able to square a 5-digit number without writing down partial results. How does he do it? I picked ...
Posted in Trick, Fast Arithmetic, Algebra | 10 Comments »
Wednesday, January 2nd, 2008
Here is one of my very favorite Math tricks that's sure to impress your friends (and yourself the first time you try it). I learned this trick over 30 years ago and amazingly enough I still remember it.
Take 16 index cards and prepare them as follows:
Make a diagonal cut at ...
Posted in Trick, Fun | 11 Comments »
Tuesday, November 27th, 2007
Here's something fun, not too heavy on the Math unless you want it to be, and quite remarkable to those who haven't seen this before. You're going to create a Moebius strip, and variations on it, and surprise yourself and others when you see what you get when you cut ...
Posted in Trick, Fun | 9 Comments »
