A brief discussion about the concept of primes. Also included are some prime-sense: what are the possible last digit of a prime number? How many primes are in the first hundred natural numbers? etc.

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# Math BASICS

Numbers, Logics, Shapes — they are the very basics.

### Geometry, Junior Math (Gr 6 - 9), Math BASICS

# Protected: Regular Polygons and Perfect Circles – Defs & Principles

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### Geometry, Math BASICS, Numbers

# Protected: The (3-4-5) Pattern for Pythagorean Triplets

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### Geometry, Math BASICS, Numbers

# π Ideas (1) a Fun Way of Finding the π Value

#### This describes a fun way to find the π value.

It does not use any area calculation. Not even directly apply the Pythagorean Theorem. Basically it uses *the radius* as a *unit* to measure *the circumference* along the circle. But how can you measure a curve using a line segment, without getting into tech difficulties? There’s simple yet smart solutions. Read on, you can find that out!

### Algebra, Equations and Inequalities, Glossary, Math BASICS

# Def: Unknowns

An unknown is an quantity we do not know yet.

In algebra, an unknown is represented by a letter. We will later find the value of unknown from the given conditions (this is called “solving for unknown”).

### Glossary, Math BASICS

# Def: Zero, the origin of

Zero originated from Hindu.

### 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.