Octadecimal In Mathematics?

Question

What is Octadecimal In Mathematics???

What is it? Please Explain.

Answer 1

Octadecimal is used in the logics and in computer applications.
It consist of digits from 0 to 7 i.e base 8.
So it is called octadecimal.
Most frequently using is Binary 0 nad 1.
Others are Hex and normal maths Decimal.

Answer 2

Base eight is octal; base-16 is called hexadecimal. Y'all are getting the words mixed up. Octadecimal includes deci (10). Add deci to oct, you get base-18. No one has ever advocated base-18 that I know of.

Now octadecimal (base-18) has as much math advantage as dozenal (base-12). In a case of ones' place with a 3 or 9 (or 15-digit if one exists), it's always a multiple of 3; and with a 0 or 6 (12-digit if one exists) always a multiple of 6. Dozenal gives us in addition a 0, 4, and 8 for all multiples of 4, but 9 as a factor is movable. Base-18 gives us a 0 and a 9 on every multiple of 9, but at the expense of the multiples of 4.

Answer 3

Octadecimal is base 8. I think octal would be more standard. Computer programmers might use the term octadecimal but I would expect mathematicians to use octal.