topic 10 : number systems & bases

natural number (N)

a positive whole number used for counting, including zero.

integer numbers (Z)

all whole numbers; positive, negative & zero. includes all of N.

rational numbers (Q)

any number that can be expressed as a ratio or fraction. includes all of Z.

real numbers (R)

any possible real-world quantity expressed as a number. includes all of N, Z & Q.

what are the main four mathematical notations ?

N, Z, Q & R

ordinal numbers

numbers used to describe the numerical position of objects.

irrational numbers

any number that can’t be expressed as a fraction.

which type is preferred for counting ?

natural numbers

which type is preferred for measuring ?

real numbers

bits

the fundamental unit of information

binary prefixes

kibi, mebi, gibi, tebi

decimal prefixes

kilo, mega, giga, tera

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