Arithmetic operations

Why is minus into minus a plus?

Why is minus into plus a minus?

For answers, read on…

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Number line

What are Natural numbers, Whole numbers and Integers ?

Why do we need Negative numbers?

Why is -1 less than 0?  How can there be something smaller than nothing?

Is there anything rational about Rational numbers?

What is behind the random sequence of unending decimal part in Irrational numbers?

For answers, read on…

Angles – The seed of Trigonometry

Angle in degrees or radians? Which one to choose? 

Why do we express angles in terms of fractions or multiples of π i.e. 30°, 90°, 180°, 360°… as  π/6, π/2, π, 2π … ?

Why does a circle have 360°?  Why is 360° = 2π?

What is behind the periodicity of trigonometric functions?

For answers, read on…