The basic method for adding numbers with 4 digits or more is to use column addition. Watch this video to remind yourself about how to use column addition to add up numbers with 3 digits.

A video making the rounds on social media has captured the moment a young boy broke the Guinness World Record for fastest ...

Just to keep things simple, suppose you have a a four digit PIN number 0000 to 9999 and we want to make a five digit code with a check digit. A simple way to do it would be to add all the digits ...

In August, 2010, [Alexander Yee] and [Shigeru Kondo] won a respectable amount of praise for calculating pi to more digits than anyone else. They’re back again, this time doubling the number of ...