# Vocabulary of Numbers

Numbers are the words or symbols that we use to count quantity.

We have **one** nose and **two** eyes on our face. We have **four** fingers and **one** thumb on each hand. There are **seven** days in a week. There are **twelve** months in a year. And there are one **hundred** years in a century.

In these lessons we look at:

**Cardinal Numbers**

These are "normal" numbers, eg: 1, 2, 3 etc
**Thousands**

How we use the comma (,) to separate thousands, eg: 5,000,000

**Tens And Units Blues Song**

Fun with numbers. Sing along if you like.
**Decimals**

How we use a point (.) to express numbers smaller than 1, eg: 0.9, 0.5, 0.001
**Fractions**

How we use fractions to express numbers smaller than 1, eg: ½, ¼,¾
**Ordinal Numbers**

How we write numbers that describe the "order" of things, eg: first, second, third
**Roman Numerals**

How we express numbers the hard way, with letters as symbols, eg: I, II, III etc
The symbols that we use for numbers today (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) are called

**. Another system that you sometimes see (i, ii, v, x, l, c etc) uses***Arabic numerals**Roman numerals*.