## The First Algorithm in the World

“The Euclidean algorithm is the granddaddy of all algorithms, because it is the oldest nontrivial algorithm that has survived to the present day.” – Donald Knut

How to find the maximum tile side size for a rectangle floor, so that you don’t need to cut the tiles? More seriously, the Euclidean algorithm is an efficient method for computing the greatest common divisor of two numbers.
It is named after the ancient Greek mathematician Euclid, who first described it in Euclid’s Elements (c. 300 BC).
It is an example of an algorithm, a step-by-step procedure for performing a calculation according to well-defined rules, and is one of the oldest numerical algorithms in common use.

## Have Brain? Use it!

Find the area of the rectangle if the numbers show the areas of the corresponding triangles.

Find the area of the shape.

How many squares of all different sizes are on a chessboard?

## Why choose Math at A+Click?

Practice is the best way to develop math skills, special thinking, and logical reasoning.

More than 271 million pages are returned for the keyword search “puzzle” on Google. Furthermore, tons of pages, books, and games include puzzles, questions, and problems. Which one do you choose?

Many students choose A+Click. Why? What distinguishes A+Click from other web pages? Below is the answer:

1) It has interesting, diverse questions

2) Everything is simple and visible

3) It has international competitions, statistics, and certificates

4) Everybody can have a go, even adults

5) It works on all computers, tablets, iPads, iPods, and smartphones

6) It offers endless problems (3600+ questions)

7) No charge

Certainly, we can easily find sites or books with some of these features. A+Click distinguishes itself from others by collecting all of them together. It unites the expertise of dozens of experts such as math teachers, puzzlers, logicians, and curious people in one of the simplest forms available.

“I am always ready to learn although I do not always like being taught.” – W.Churchill.   A+Click does not teach, it gives an opportunity to learn.

Learning is doing, not watching. Learning is active, not passive.

The A+Click team hopes you will find the collection interesting and useful. Try it at https://www.aplusclick.org

## Mr Barton’s Web Whizz Video on A+ Click Math

“I love NRICH, & whilst it remains my number one stop for rich maths puzzles & problems, this website might just be number two. There are literally 100s of puzzle & problems for students to solve. They are beautifully laid out on the page, making them absolutely ideal to project on the board to use as starter activities or extension work. I also suggest using them in the computer room as the website keeps a handy record of students’ progress through a series of puzzles. With the development of students creative thinking & problem solving growing in importance, this website is a must!” – Craig Barton

## How to cut cheese and why does the world need problem solvers?

I have a rectangular piece of Swiss cheese with a round hole.

How do I cut the piece of cheese with one straight line into two parts of equal weight?

I tried to cut along a diagonal line, weighed it, and found that they were not equal. Oops!

My experience tells me that a line must go through 2 points. One point belongs to the rectangle, while another belongs to the hole. Therefore, my cut now goes through the centers of these two shapes and I have two pieces of equal weight.

Simple!

When I was an young boy, I solved dozens of problems like this everyday. They became more difficult every time. Now, working as a business developer at a high tech company, my colleagues and I solve more serious and complex problems for our business on a regular basis.

I urge kids to increase their talent and sharpen their mind by practicing these types of problems, starting with simple problems and increasing the difficulty level, such as by solving puzzles at the website aplusclick.com. Of course, this will take effort and time; but trust me when I say that you will be able to experience an interesting, rewarding, and exciting life in return.

The world needs innovative creators who are able to solve problems! Practice makes perfect!