## Guest Posting Guidelines

For bloggers, guest blogging is a good way of helping each other. The guest blogger helps the host by adding content to his blog, while the host provides a place for the guest blogger to promote his blog through a back link.

In the past few months, I have received quite a number of emails inquiring if I am accepting guest posts. Yes, I do. Math and Multimedia has reached nearly 1.5 million page views in three years, and has more than two thousand followers on Twitter, Facebook, RSS, and Email Subscriptions, so  guest posting here will surely boost your  traffic. » Read more

## The Kaprekar constant 6174

In the mysterious 495, (1) we chose any 3-digit number, (2) arranged the digits in decreasing order forming the largest integer,  (3) arranged the digit in increasing order forming the smallest integer, and (4) subtracted the smaller from the larger. Each time a difference is obtained, we repeated steps 2-4 several times and we ended up having 495. We explained the mystery behind this ‘phenomenon’ and we were quite fascinated.

In this post, we examine the 4-digit Kaprekar constant. That is, if the digits of a 4-digit number are not all equal, there is a certain number that we will end up with if we repeat the enumerated process above. Let’s have an example. » Read more

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