Fundamentals of data representation

number systems, number bases, units of information, binary number system, information coding systems, representing sound/ images

state the base number for denary, binary and hexadecimal

denary = base 10

binary = base 2

hexadecimal = 16

what is a natural number?

positive whole number, including 0

draw the symbol for a natural number

give an example for when natural numbers are used

• counting (e.g. “there are 6 people here”)

• ordering (e.g. “this is the 3rd largest city in the world”)

what is an integer number

whole positive OR negative number, including 0

draw the symbol for an integer number

what is a rational number

any number that can be expressed as a quotient, fraction or ration

draw the symbol for a rational number

what is an irrational number

number that cannot be represented as fraction or ration since the decimal form will contain infinite repeating values

give 2 examples of irrational numbers

• pi

• square root of 2

what is a real number

any positive OR negative number with OR without fractional part

draw the symbol for a real number

draw all the symbols for the number systems

what is an ordinal number

number used to identify position relative to other numbers

ordinal = ORDER

e.g. first, second, third

what is a cardinal number

identifies size of something

e.g. number of elements in array or characters in string, second out of 20