## The Magic Of 1089

Take a 3 digit number. Let’s say: 375. Reverse it. The reverse of 375 is 573. Find the difference (Larger number – Smaller number). 573…

## A Series That Totals 100? Impossible!

Use digits 0 to 9 (or 1 to 9), each once and only once, to make a total of 100. You might have played this…

## Indian Mathematics: How To Write A Magic Square?

A magic square is a square of numbers where each row, column, and diagonal gives the same sum. A n x n magic square has…

A quadrilateral ABCD is given. The midpoint of side AB is equidistant from three other sides of the quadrilateral. Prove that the square of AB…

## Olympiad Corner: What Is The Sum Of The Corner Entries?

In a 4 x 4 array of 16 numbers, the sum of the numbers in each row, column, and diagonal is 1. Find the sum…

## Olympiad Corner: Summing Up A Series

We have a series: tan(1)tan(2) + tan(2)tan(3) + … + tan(2019)tan(2020). What is its value? Here is a summation problem involving trigonometric functions. Do you…

## Olympiad Corner: An Expression Under The Square Root

Find the product of four consecutive numbers. Add 1 to this product. Extract the square root of this expression. What is the value? How to…

## Olympiad Corner: A Trig Touch To Geometry

AB is perpendicular to BC. E and F are two points on BC such that AB = BE = EF = FC. Angles AEB, AFB,…

## Olympiad Corner: How Many Right Triangles?

How many right triangles have their area double of their perimeter? How to find the exact number of such triangles? Do you have a mathematical…

## Olympiad Corner: Circle Inside, Circle Outside

A circle is inscribed in a triangle. And a circle is circumscribed about the same triangle. What is the ratio of their radii? Note that:…