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natural numbers
a set consisting of all positive whole numbers and zero. symbol N
integer numbers
a set consisting of all whole numbers including zero. symbol Z
rational numbers
a set consisting of all numbers that can be written as a fraction with integers on either side. symbol Q
irrational numbers
a set consisting of all numbers that cannot be written as a fraction e.x. pi, surds. no symbol
real numbers
a set consisting of all possible real world quantities(rational and irrational numbers
ordinal numbers
integers used to describe an item's position in a series (1st 2nd 3rd etc)