#### notes

**Rational numbers:** A number that can be made by dividing two integers (an integer is a number with no fractional part). The word comes from "ratio".

**Natural numbers :** A natural number is a number that occurs commonly and obviously in nature. As such, it is a whole, non-negative number.

**whole number :** Whole numbers are positive numbers, including zero, without any decimal or fractional parts.

**Integers:** An integer is a number that has no fractional part, and no digits after the decimal point. An integer can be positive, negative or zero.