A rational number is a number that can be written as a ratio.
Every whole number is a rational number, because any whole number can be written as a fraction.
All numbers that are not rational are considered irrational. An irrational number can be written as a decimal, but not as a fraction. An irrational number may have endless non-repeating digits to the right of the decimal point. Although irrational numbers are not often used in daily life, they do exist on the number line. The Learning Network Inc. All rights reserved.