I like mathematical puzzles (and mathematical humour).

They provide intellectual challenges and mental stimulation. They also help the puzzler to learn and develop good problem-solving techniques. These techniques can sometimes be used when solving strategy problems in real life and can certainly be used in other mathematical pursuits. I have hundreds, and possibly thousands, of puzzles to share with you. This represents a small start!

I have decided to bundle them in groups of twenty:

CCM Puzzle Collection #001 ~ Puzzles 001-020

- Three Switches and a Light
- A Knockout Tennis Competition
- Covering a Modified Chessboard With Dominoes
- Completing a Tour of Towns
- Packing Eight Numerals Into Eight Squares
- Counting the Number of Pathways to a Given Place
- A Matter of Symmetry
- Which Shape is MOST Different?
- Riding a Falling Ladder
- Divide an Obtuse-Angled Triangle into Seven Acute-Angled Triangles
- Divide a Square into Ten Acute-Angled Triangles

all my questions about chain rule were answed by this video, it very helpfull to me

Thamsanqa C (on a CCM YouTube video about the Chain Rule)

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