Here’s the short version: A 16 is any number which is four times the length of a regular four-digit number. For example, if you wanted to count 16, you could use the number 1,024,576 as your “real number” and then “remedy” the number by dividing the number by 16. That’s how many 16-digit numerical values you can use.

To be precise, the 16th number is called a hexadecimal digit. This digit is represented by the letters ‘HEX’.

Hexadecimal digits are generally used to represent digit or decimal numbers but also any integer values which may be divisible by 16. For instance, if you had a decimal number, say 64, you could use the “64” hex representation to identify that it is a decimal number which is 4 times 8, or 4 * 16 = 16.

As an example, we could use a hexadecimal number 64 to represent our decimal number 8, or 8 * 16 = 16. A hexadecimal digit does not have to be an exact match but the similarity in appearance is key. The “64” hex representation also matches “00” hexadecimal, and so is commonly abbreviated to “hex”.

Here’s another bit of info for you: you can have a single, single number in hex that has the same hex representation as another, single, hexadecimal number. The first number will have an “01” and the second will have an “02” hexadecimal digit. So, a hexadecimal number that starts with 1, and has the hex representation of 01, 010101 is the same as a hexadecimal number that starts with 001110. Another way to put it is that 0x is 1 hex, and 0x1111 means 2 hex. So, 0xa is 1, and 0x11, in hexadecimal form, means 5 hex.

How you add hexadecimal numbers is quite different from using them as a decimal or number. We’ll have a look at this more in the next chapter. In the meantime, just remember all numbers in hex are in the same format as they are as a decimal value, even if they are in a different form.

If we want to know where a hexadecimal number ends, we just add the 0x and the hex representation of the number to their decimal or number form and

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