13. Number systems Flashcards

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1
Q

what is a natural number?

A

A whole number that is used in counting.

Includes 0

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2
Q

What symbol can be used to represent a natural number?

A

N

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3
Q

what is an integer number?

A

A whole number that could be positive or negative

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4
Q

What symbol can be used to represent an integer number?

A

Z

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5
Q

what is a real number?

A

Any number that is natural, rational or irrational.

The set of real numbers is the set of all possible real world quantities.

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6
Q

what is a rational number?

A

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

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7
Q

What symbol can be used to represent a rational number?

A

Q

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8
Q

What is an irrational number?

A

A value that cannot be expressed as a fraction and has an endless series of non-repeating digits.
for example, pi 3.141592…

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9
Q

What symbol can be used to represent a real number?

A

R

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10
Q

What is an ordinal number?

A

Describes a numerical position or object in a list- e.g 4th

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11
Q

why do we use the hexadecimal number system?

A

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

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