We use numbers everyday to count, measure and label.  From telephone numbers and addresses, to shopping lists and managing finances; numbers are part of our daily life and activities.

We write and represent numbers using a numeral system which consists of different types of number expressions.


Natural Numbers

Sometimes called whole numbers, natural numbers are used to count and order.


Examples: Counting

  • There are two tickets left for the concert.
  • I wake up at 7:30 in the morning.

Numbers used for counting, are commonly referred to as cardinal numbers.


Counting from 0 (nought) – 20 (twenty)

0  1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19  20


Counting from 21 (twenty-one) – 25 (twenty-five)

21                   22                   23                   24                   25



Counting from one hundred – one hundred and five

100              101              102              103              104              105


Numbers 101 – 199 are said by adding the next number in the number line. You would say how many hundreds, tens and ones (units) e.g. 101 is “one hundred and one.”, 121 is “one hundred and twenty-one”.


A hundred



You can either say “one hundred” or “a hundred”.




Examples: Ordering

  • My appointment is on the 5th of January.
  • In sports, medals are given for 1st, 2nd and 3rd place.

Numbers used for ordering, are commonly referred to as ordinal numbers.




Other types of natural number are nominal numbers. These are only used to categorise and identify and do not represent value, quantity or any other measurement. Some of these “numbers” also include letters in their sequence and are called alphanumeric.

  • The product code is: ABC-abc-1234









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