B. Rational and Irrational Numbers

Radical is from the Latin word radix meaning "root".

Radicals belong to two main number sets within the Real Number System : Rational Numbers {Q} and Irrational Numbers .

Rational Numbers are numbers that can be expressed in fraction form. Some rational numbers are also Natural Numbers , Whole Numbers , and/or Integers .

Recall that even an Integer (negative and positive numbers including 0) can be written in fraction form.

Click here for this lesson in video format.