Rational Numbers - a number that can be written as a fraction. Rational numbers are all real numbers, and can be positive or negative. A number that is not rational is called irrational., Integers - whole numbers and positive or negative numbers, Whole Numbers - counting numbers but also include zero 0, Counting Numbers - Natural numbers or numbers that you count with., Irrational Numbers - any number that is not rational. It is a number that cannot be written as a ratio of two integers or cannot be written as a fraction. The square root of 7 is an irrational number.,

Sets and Subsets of Rational numbers

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