Natural numbers are those numbers that you’re using every day. Natural numbers are including values from 1 to infinity.

All the numbers you may count on your fingers and toes are natural numbers.

**Natural Numbers.** Examples are: 1, 2, 5, 18, 150, 1,586, 258,569.

**Whole Numbers. **We refer to whole numbers when we mean natural numbers except that whole numbers also include 0.

**Prime Numbers.** A prime number has exactly two factors, 1 and itself. So, 2, 3 5, 7, etc.

**Composite numbers. **The opposites of prime numbers are composite numbers. They can be divided by many different numbers without having a remainder left, such as 4, 6, 8, etc.

**Integers. **Did you see how these number lines all start at 0? Number lines that have integers may have every positive or negative number.

Any number in between two integers may be represented both as a decimal and as a fraction.

But fractions and decimals are NOT integers.

**Rational Numbers. **Rational numbers are just other terms for fractions. The word “rational” is derived from the word “ratio.”

When we refer to a rational number, we talk about a ratio of two integers.

### Video Summary and Quiz

Next Lesson: Prime Numbers and Factoring

*Last Updated on April 12, 2021.*