Rational numbers are numbers that can be expressed as a ratio of
two integers. They can be in fraction, decimal or whole number
form. Irrational numbers are numbers that cannot be expressed as a ratio of two integers. Go to the lesson on number subsets for further review.
Let's take a look at "pi" (π) for example. Pi has many different forms and approximations.
The three
approximations of pi are rational
numbers. The actual number pi is an irrational number. Nonperfect square roots are also irrational... Examples are:, , and
