1
L1 Real Numbers; Algebra Review
Sets of Numbers
Natural numbers
:
Whole numbers
:
Integers
:
Rational numbers
:
{
a
x
x
b
=
, where
a
and
b
are integers and
}
0
b
≠
Note
:
1)
Any integer
m
can be written as
1
m
, thus, all
integers are rational numbers.
2)
Rational numbers include repeating and
terminating decimals, for example:
1
0.333...
0.3
3
=
=
0.9
1.0
1
=
=
Irrational numbers
:
Includes any real number that is not
a rational number, for example:
Real numbers
:
The rational and irrational numbers
together.

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