The Real Number
System is made up of
all the points on the number line.
Real Numbers are either integers,
rational
or irrational.
(These are the subsets of the real number system.)
Since integers can be written in fractional form,
integers can also be considered rational numbers.
The numbers shown here represent both
rational and irrational numbers.
The integer, 2,
is a rational number. 
The decimal number 0.5
is also a rational number. 
Pi ()
(3.14)
is a decimal number that, to our knowledge, has no end and
cannot be expressed as a ratio of two integers. Therefore
it is an
irrational number. 
Repeating decimals are also rational numbers.
Take for example the repeating decimal
This
can be expressed as a ratio of two integers as
Let's
Practice!
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