# Counting to 20 and Teen Numbers

- Link: https://thecuriosi.com/lessons/teen-numbers-to-20/
- Published: 2026-10-31T14:54:47+05:30
- Author: MAHENDRA MANCHIKALAPATI

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You can count to ten. Let’s keep going! Today you will count all the way to **twenty**
and learn about the **teen numbers**. Teen numbers are special, because each one
is made of ten and some more.

## Counting from 11 to 20

After ten comes:

eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen,
twenty

### Tricky names

_Eleven_ and _twelve_ do not sound like the others, so they need extra practice.
From thirteen to nineteen, you can hear a small number at the start: thir-teen (
3), four-teen (4), fif-teen (5).

## Teen numbers are ten and some more

Look at the numeral **14**. The 1 means **one ten**. The 4 means **four more ones**.
So fourteen is ten and four more.

  |  Number |  Ten |  Ones |  Say it |  
   |  11 |  10 |  1 |  ten and one more |  
 |  13 |  10 |  3 |  ten and three more |  
 |  15 |  10 |  5 |  ten and five more |  
 |  18 |  10 |  8 |  ten and eight more |  
 |  20 |  two tens |  0 |  two tens |

### Example

Ben has 10 marbles in a bag and 6 marbles on the table. He counts: “ten in the bag…
eleven, twelve, thirteen, fourteen, fifteen, sixteen.” He has **16** marbles. That
is ten and six more!

## Use a ten frame

A **ten frame** is a box with ten spaces, in two rows of five. When it is full, 
you have ten. Fill one ten frame, then put extra counters next to it to show teen
numbers.

 * A full ten frame plus 2 counters shows **12**.
 * A full ten frame plus 7 counters shows **17**.
 * Two full ten frames show **20**.

### Counting on

You do not need to start at one every time. If you already know there are 10, start
at ten and **count on**: “ten… eleven, twelve.”

## Key takeaways

 * After ten we count eleven to twenty.
 * Teen numbers are one ten and some more ones.
 * A full ten frame shows ten.
 * You can count on from ten instead of starting at one.

## Practice

Use counters or draw dots. Show these numbers as **ten and some more**: **12, 15,
19**.

Answers: 12 is ten and 2 more, 15 is ten and 5 more, 19 is ten and 9 more.

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 [ Previous lesson Writing Numbers from 0 to 10 ](https://thecuriosi.com/lessons/writing-numbers-0-to-10/)
[ Next lesson Tens and Ones ](https://thecuriosi.com/lessons/tens-and-ones/)

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