# 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.

On these pages we look at:

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

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

**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.

**Decimal Numbers
**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

**Roman Numerals
**How we express numbers the hard way, with letters as symbols, eg: I, II, III etc

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

*Arabic numerals**Roman numerals*.