Recently, I have been presented with some problems that I used a “date arithmetic” to solve. I thought it might be a neat little “trick” to write about. Please click on the file name below to see the pdf file.
Using Date Arithmetic

I have constructed a number of staircases in my little carpentry projects. Here is how I decide how steep the stairs are (in degrees) and what angle to cut my two-by-twelve at to make the stairwells. Please click on the file name to see the pdf file.
Using “Rise and Run” to Build A Staircase

As a young 19 year old, in the fall of 1967, I walked into two Math classes at the University of Victoria that had a profound effect on the rest of my life. One was a computer programming class, and the other was a Projective Geometry, or Non-Euclidean Geometry class. Please click on the file [...]

The two videos below, shows an easy way to deal with equations that contain decimals.

Dodeca, like a lot of students, suddenly freeze when one or more fractions appear in an equation. Here is a simple way to solve these by eliminating the fraction(s) really quickly. Please click on the comic strip to enlarge if necessary.

Here, Icosa explains to Hexa, how to measure angles and what the parts of an angle are and what types of angles do you get.  Please click on the comic strip to enlarge if necessary.

Last Sunday, August 9, 2009, I gave readers the great “3 Prisoner Puzzle”. In a day or two I put the same puzzle up on Youtube.com and direct people to this page to see the answer. However you saw the puzzle, you can see the answer, and two new puzzles, by clicking on the file [...]

When you see divisibility rules in a mathematics textbook, the divisibility by 7 rule is usually left out. By remembering the sequence 1 – 3 – 2, you can, with practice, quickly determine whether a number is divisible by 7 or not, and if not, what the remainder will be.  Please click on the file [...]

I am building a dome over top of my hot tub. I need to cut out some triangles from a sheet of plywood, and I want to make life easier for myself by making as few cuts as possible, and working with smaller parts of the sheet of plywood as often as possible. I needed [...]

Brahe did his observations before the telescope was invented in 1609. He left a legacy of highly accurate observations that those who followed him, such as Kepler and Galileo. And he left a bit of a mystery as well. Read on, by clicking on the file name below to see the pdf file.
Tycho Brahe, last [...]