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 ...

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 number 1 has one digit and is divisible by 1; 12 has two digits and is divisible by 2; 123 has three digits and is divisible by 3. Which new digit (not already used) can be added to the end of 123 ...

This pin might make you an easy target. Many people have difficulty selecting and remembering a passcode, especially when it involves four-digit pins. But if you plan to default to something as easy ...

Addition involves finding the total of two or more numbers or amounts. There are different things you can use to help you add. You can use number lines, place value charts and place value counters.

A study of over 216 million four-digit PIN codes shows which combinations are chosen particularly frequently and are therefore the easiest to crack. A recent analysis of over 216 million four-digit ...