Number Systems
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What are natural numbers and give an example.
Natural numbers are positive whole numbers that can be used for counting. N = {0,1,2,3,4…}
What are integer numbers and give an example.
Integer numbers can be positive or negative whole numbers. Z = {…-2,-1,0,1,2…}
What are rational numbers and give an example.
Rational numbers are numbers that can expressed as a fraction or in a ratio. Q = {…100/2, 3/7…}
What are irrational numbers and give an example.
Irrational numbers are numbers that cannot be expressed in a fraction or ratio. Q’ = {…pi, root 2 …}
What are real numbers and give an example.
Real numbers are any value that is a natural, integer, rational or irrational number. R = {…2, 24/5, pi, -30…}
What are ordinal numbers and give an example.
Ordinal numbers are used to express the position of an item in an ordered list or sequence. 1st 3rd 6th -For example an index of an item in an array