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