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 ...

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 ...

Adding larger numbers in your head is not always easy. If you need to use pen and paper, then the column method is a good way to add. It involves writing one number beneath the other, so that the ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. If you needed any more incentive to beef up your iPhone’s password ...

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 ...

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 ...