The document discusses different types of real numbers including natural numbers which are positive but do not include zero, whole numbers which include positive numbers and zero, integers which include positive, negative and zero, rational numbers which can be expressed as a ratio of two integers, and irrational numbers which cannot be expressed as a ratio of two integers.

1. The Real Number
System
by Marshall Lewis

2. Natural Numbers
A natural number is positive but there is no zero.

3. Whole Numbers
A whole number has a positive number as well as zero.

4. Integers
An integer is when you can use positive or negative or
zero.

5. Rational Numbers
a rational number that can be expressed exactly by a ratio
two integers.

6. Irrational Numbers
A number that cannot be exactly expressed as a ratio of
two integers.