Dodeca and Icosa carry on with yesterday’s look at quadrilateral types. They also look at the difference between a definition of a shape, and its properties. Please click on the comic strip to enlarge if necessary.

Here we introduce the readers to the types of quadrilaterals. More types will come tomorrow, and then we will start to look at the properties of all these different shapes. Please click on the comic strip to enlarge if necessary.

As seen on June 21, 2009, the Alphametics (or alphanumerics) puzzles are neat things for logic. Here are four more for you to try. Please click on the file name to see the pdf file.
Some More Alphametics Puzzles

My daughter emailed me a “Chocolate Math” trick that had been making the rounds. It magically worked out your age.  I show you the trick, and how it works. Please click on the file name to see the pdf file.
The Secret Behind the “Chocolate Math” Trick

There was a bit of a controversy in the newspaper recently about why there were more winners in one lottery than there were in another lottery, even though they had the same probabilities of winning. Please click on the file name below to see the pdf file, and a solution to the conundrum!
Using Probability to [...]

There are many branches of mathematics. This post describes one of them, started by a young genius who died mysteriously at a young age. Please click on the file name to see the pdf file.
Galois, A Boy Genius, but a Poor Dueler

In the next 5 weeks, I will show you 5 ways to solve quadratic equations. Quadratic Equations occur when you have a power of 2 involved in the equation, such as 3x^2 + 5x — 7 = 0. They are (1) Square Root Method, (2) Factoring, (3) Quadratic Formula, (4) Solve by Graphing, and (5) [...]

Triangles can be separated into six different types, three that talk about their angles, and three that talk about the lengths of their sides. Please click on the comic strip to enlarge if necessary.

Here, we learn how to measure a length in both inches, and eighths of an inch, and centimetres and tenths of a centimetre. Please click on the comic to enlarge if necessary.

Here is a neat little puzzle for your classroom, or yourself.  Please click on the file name to see the pdf file.
The Four 4’s Puzzle