Counting from the first relevant use, the symbol π has already had a history of more than 360 years!

Do you know who has used it first and who has made it popular?

### Numbers

# Prime numbers

Prime numbers, composite numbers, and prime factorization; these concepts are described and examples given.

### Junior Math (Gr 6 - 9), Numbers

# What’s So Special about Number 8208?

The seemingly trivial, innocent number 8208 actually has something special. It is a member of a niche class of numbers called narcissistic numbers. And it has an interesting property that 8^{4} + 2^{4} + 0^{4} + 8^{4}= 8208.

Why the name narcissistic number? Keep reading, you’ll find out.

### Math for Early Age /Elementary (G5 under)

# On the Patterns (2)

Let us look into a pattern with colours, stars, as well as numbers! They are related in a magic way! And that way is what we call as a pattern!

### Geometry

# Length of Hypotenuse (3) and PT — the Pythagorean Theorem

This is the conclusion part on calculate the hypotenuse. We come to Pythagorean Theorem through own our effort!

### Geometry

# Hypotenuse of a Right Triangle — by Area Approach (2)

Continuing from Part one of this article. We look at the hypotenuse when the two legs are in 1:2.

### Counting and Combinatorics, Discrete Math Models

# Pigeonhole Principle

You can read an interesting introduction on pigeonhole principle, and find surprising applications like “why there are at least two people in Calgary whose hair is the same”. Questions requiring the “Pigeonhole principle” frequently appear in high level math competition questions like IMO.

### Algebra, Junior Math (Gr 6 - 9), Methods of Learning, Numbers

# A Magic-square Like Puzzle, with Usual and Shortcut Solutions

Once we understood a math problem, and mastered relevant methods, we can find many different ways to solve the problem. That is, there are many shortcuts.

### Algebra, Equations and Inequalities, Junior Math (Gr 6 - 9), Math BASICS, Numbers

# Solve /Find a Number by Algebra

Word problems with numbers are a convenient facility to learn equations.

### Geometry

# Ribbon Square is Fun

Have you ever tried to use ribbons crossing each other to enclose a square? And do it in a rectangle “something”, like a pool in fitness center?

Some questions are: What is the largest ‘ribbon square’ you can make? And the smallest? How many altogether?