Number systems and bases Flashcards
what is a natural number
any positive whole number that is used for counting, 0,1,2,3
- includes 0
what is an integer
any positive or negative whole number, including 0
represented by Z
what is a rational number
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”
what are real numbers
any possible real world quantity expressed as a number
- does not include imaginary numbers
- R
what are ordinal numbers
a number used to describe the numerical position of objects
What is a irrational number?
A number that can’t be expressed as a fraction like root 2 - expressed as P
lowest and highest number that can be created with binary
0
2^n - 1
Binary number to hexa decimal
- Put the binary number into groups of four binary digits
Hexdecimal to binary
Group the numbers into four and translate each group to binary
why is the hexadecimal number system used
- 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
when are hexadecimal values used
colour
increasing size of bytes
kilo
kibi
mega
mebi
giga
gibi
tera
tebi
why cant ascii be used for arithmetic
because the number character is not the same as the actual number value
highest and lowest hex num
00
FF