13. Number systems Flashcards
what is a natural number?
A whole number that is used in counting.
Includes 0
What symbol can be used to represent a natural number?
N
what is an integer number?
A whole number that could be positive or negative
What symbol can be used to represent an integer number?
Z
what is a real number?
Any number that is natural, rational or irrational.
The set of real numbers is the set of all possible real world quantities.
what is a rational number?
Any number that can be expressed as a ratio or a fraction.
this includes all integer values expressed as a fraction over 1 e.g. 7/1
What symbol can be used to represent a rational number?
Q
What is an irrational number?
A value that cannot be expressed as a fraction and has an endless series of non-repeating digits.
for example, pi 3.141592…
What symbol can be used to represent a real number?
R
What is an ordinal number?
Describes a numerical position or object in a list- e.g 4th
why do we use the hexadecimal number system?
used as shorthand for binary since it is simple to represent a byte in just 2 digits
fewer mistakes are likely to be made in the writing of a hex number than a binary number
hex is easier to write and remember as a human
