This is the way we call numbers after ten:

Eleven – 11

Twelve – 12

Thirteen – 13

Fourteen – 14

Fifteen – 15

Sixteen – 16

Seventeen – 17

Eighteen – 18

Nineteen – 19

Twenty - 20

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It is possible to count objects using numbers from 1 to 10 if there are no more than 10 items. Also, there are numbers after 10. How to form them? We need to add the number 1 to the previous numeral. Let's start with the number ten. If we add 1, we will get the next number, which is 11. The number after 11 is 12.

Twelve (12) and one (1) equals thirteen. This number is indicated by the digit 13.

Thirteen (13) and one (1) is fourteen. This number looks like 14.

Fourteen (14) and one (1) will be fifteen. We write it as 15.

Fifteen (15) and one (1) equals sixteen. We indicate it by the number 16.

Sixteen (16) and one (1) is seventeen. See how we denote it: 17.

Seventeen (17) and one (1) equals eighteen. Let’s indicate it: 18.

Eighteen (18) and one (1) will be nineteen. This number is denoted by the digit 19.

Nineteen (19) and one (1) is twenty. This is the number 20.

Have you noticed that the digits of numbers after 10 may be familiar to you? It is because we use the same digits, denoting the numbers from 1 to 10. With their help, we can define all the numerals, even the largest ones.

You can see that the new numbers after ten consist of two digits. The first digit indicates how many times we add tens (the number 10) to get this amount. The second digit shows how many times we add the number one to ten. So, in the number 12, we put the number 10 once and the number 1 twice, firstly to 10, then to 11.

And the number 20 contains two tens, without adding the number one.

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