Number systems and bases Flashcards

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1
Q

what is a natural number

A

any positive whole number that is used for counting, 0,1,2,3
- includes 0

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2
Q

what is an integer

A

any positive or negative whole number, including 0
represented by Z

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3
Q

what is a rational number

A

any number that can be expressed as a ratio or a fraction - 1/2, where both the numerator and denominator are whole numbers
represented by “Q”

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4
Q

what are real numbers

A

any possible real world quantity expressed as a number
- does not include imaginary numbers
- R

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5
Q

what are ordinal numbers

A

a number used to describe the numerical position of objects

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6
Q

What is a irrational number?

A

A number that can’t be expressed as a fraction like root 2 - expressed as P

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7
Q

lowest and highest number that can be created with binary

A

0
2^n - 1

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8
Q

Binary number to hexa decimal

A
  • Put the binary number into groups of four binary digits
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9
Q

Hexdecimal to binary

A

Group the numbers into four and translate each group to binary

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10
Q

why is the hexadecimal number system used

A
  • it’s simpler to represent a byte in just two digits
  • fewer mistakes are likely to be made
  • easier for technicians and computer users to write or remember hex values than a binary number
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11
Q

when are hexadecimal values used

A

colour

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12
Q

increasing size of bytes

A

kilo
kibi
mega
mebi
giga
gibi
tera
tebi

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13
Q

why cant ascii be used for arithmetic

A

because the number character is not the same as the actual number value

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14
Q

highest and lowest hex num

A

00
FF

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