# The Area of a Disk

If you are aware of elementary facts of geometry, then you might know…

Triangle inequality has its name on a geometrical fact that the length of…

Ramanujan (1887-1920) discovered some formulas on algebraic nested radicals. This article is based…

This is the last month of the glorious prime year 2011. We are…

Applied mathematics is one which is used in day-to-day life, in solving tensions…

If mathematics was a language, logic was the grammar, numbers should have been…

What is Logic? If mathematics is regarded as a language, then logic is…

You might be thinking why am I writing about an individual number? Actually, in previous year annual exams, my registration number was 381654729. Which is just an ‘ordinary’ 9-digit long number. I never cared about it- and forgot it after exam results were announced. But today morning, when I opened “Mathematics Today” magazine’s October 2010, page 8; I was brilliantly shocked. 381654729 is a nine digit number with each of the digits from 1 to 9 appearing once. The whole number is divisible by 9. If you remove the right-most digit, the remaining eight-digit number is divisible by 8. Again removing the next-right-most digit leaves a seven-digit number that is divisible by 7. Similarly, removing next-rightmost digit leaves a six-digit number that is divisible by 6. This property continues all the way down to one digit.

Further research on this number turned out to have a name “Poly-divisible Number.”

Mathematical Wonders happen with Mathematicians.

Before my college days I used to multiply this way. But as time passed,…

Multiplication is probably the most important elementary operation in mathematics; even more important…

A triangle $ T $ is divided into smaller triangles such that any…

Problem1: Smallest Autobiographical Number: A number with ten digits or less is called…