There are many opportunities to use 'four-digit PIN numbers' in our daily lives, such as credit card PIN numbers, smartphone passcodes, and PC unlock codes. In all cases, we should use four-digit ...

The iPhone calculator is great for crunching numbers in a pinch, but you can also use it to have some fun with your friends and family. Here are some cool calculator tricks you can use to find someone ...

Nick Berry, president of the data mining consulting company Data Genetics, recently wrote a blog post about how easy it to guess a person's four-digit PIN. Robert Siegel talks to Berry about his ...

Kelly-Ann Franklin has spent more than two decades in journalism which has helped her build a wide knowledge base of business and personal finance topics. Her goal with editing is to ensure tough ...

To make the transitions smooth and simple, the Railways have decided to replace the existing four-digit numbering system for trains with five-digit. The new system will make the numbering trains of ...

Four-digit numbers can be partitioned into ones, tens, hundreds and thousands. Understanding the value of each digit makes it easier to compare numbers using the less than (<), greater than (>) and ...

Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...

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A brain teaser shared on Instagram has been keeping people hooked to their screens. It features three hints on the basis of which one needs to find a four-digit number. A question on the brain teaser ...