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# Why is there 4 more numbers after my ZIP Code?

## Why is there 4 more numbers after my ZIP Code?

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or a post office box.

### How many 4 digit palindromes are there?

90 palindromic numbers
There are likewise 90 palindromic numbers with four digits (again, 9 choices for the first digit multiplied by ten choices for the second digit.

#### How many zip codes are palindromes?

Less than 50 of the 100000 possible 5-digit ZIP Codes which are currently in use are palindromic primes.

What is a ZIP 4 code and how is it different from a 5 digit ZIP Code?

What is a zip+4 code, and how is it different from a 5 digit zip code? A more detailed mailing code consisting of the original 5 zip code digit followed by a hyphen and four additional digits. These digits identify a specific geographic segment in delivery area.

How many palindrome numbers can you make with 4 digits with the possibility of repeating the digits?

So, there are 9*10 = 90 palindromes. Originally Answered: What is the four-digit number in a palindrome? 1001, 1111, 1221, 1331, 1441, 1551, 1661, 1771, 1881, 1991, …, 9009, 9119, 9229, 9339, 9449, 9559, 9669, 9779, 9889, 9999 TOTAL 90 palindromes.

## How many 4 digit numbers are divisible by 11 or not palindromes?

As for palindromes, we have nine choices for the first digit (0 won’t do) and ten choices for the second. The first and second digits being set, the third and fourth are determined. Thus there are 90 palindromes, all divisible by 11. The number of non-palindromes divisible by 11 is 819-90=729.

### What is the smallest 4 digit palindrome?

The Number 2112 is meeting all the criteria. It’s a Palindrome, it’s divisible by 4 and since we started at the lower end, it is also the smallest 4 Digit palindrome. Thus, 2112 is the required answer.

#### What 3-digit palindrome can you add to 2017 and get a 4 digit palindrome as your answer?

24
23. A palindrome, such as 303 or 8668, is a number that remains the same when read backwards. What 3-digit palindrome can you add to 2017 and get a 4-digit palindrome as your answer? 24.

What is a palindrome of 89?

89 takes an unusually large 24 iterations (the most of any number under 10,000 that is known to resolve into a palindrome) to reach the palindrome 8,813,200,023,188. 10,911 reaches the palindrome 4668731596684224866951378664 (28 digits) after 55 steps.

How do you create a palindrome number?

Try this:

1. Write down any number that is more than one digit. ( e.g. 47)
2. Write down the number reversed beneath the first number. ( 47+74)
3. Add the two numbers together. ( 121)
4. And 121 is indeed a palindrome.

## What are the numbers after the ZIP code?

Also called “plus-four codes”, “add-on codes”, or “add-ons”, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.