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Last updated on August 5, 2025
Number names are a way of expressing the written form of numbers using letters. Learning number names will help you learn the basics of counting, addressing parcels, official documents, and so on. In this topic, we will learn number names from 11 to 30.
These are the words we use to represent numbers, making them easier to read.
Take the number 15 — it is written as ‘Fifteen’.
Writing numbers in words not only helps us write legal documents and fill forms, but it also improves a student’s spelling skills.
There are two main ways of naming numbers:
Indian Numbering System
International Numbering System
Understanding both systems will help in communication and arithmetic calculations.
Now, let’s discuss the two numbering systems.
In the Indian Numbering System, digits are assigned place values starting from the right. These place values include ones, tens, hundreds, and thousands, and continue to grow as the number increases.
For example, in the number 28, the digit 8 is in the ones place, and 2 is in the tens place.
Starting from the right, the order goes:
Ones → Tens → Hundreds → Thousands → Ten Thousands → Lakhs → Ten Lakhs → Crores
Each digit holds a value based on its position.
Let’s take an example of the number 23.
It is written as Twenty-Three.
The number gets placed as:
2 in the tens place
3 in the ones place
Just like the Indian Numbering System, the International Numbering System also uses names, and they differ for bigger numbers. The place value starts from the right. The place values are ones, tens, hundreds, thousands, hundred thousands, millions, ten millions, hundred millions, and so on. Let’s take the example of 27. The number is written as Twenty-Seven. The number gets placed as: 2 in the tens place 7 in the ones place
Learning the names of the numbers from 11 to 30 using a chart will make it easy for the students to write the numbers in words. List of Numbers in Words 11 to 30 The list given below shows how numbers from 11 to 30 are written using letters. Learning to write the numbers in words improves their skills in reading and writing.
While writing numbers from 11 to 30, there are certain rules to be followed. Below discussed are some rules to keep in mind while writing the names of numbers. Rule 1: The numbers from 11 to 19 have unique names that do not follow a specific pattern. For example, 13 is written as Thirteen. Rule 2: Numbers from 20 to 29 are written with the base "Twenty" followed by the unit place name. For example, 24 is written as Twenty-Four.
Always use a hyphen while writing numbers like 25 and 28. It should be written as Twenty-Five and Twenty-Eight. Always keep in mind the unique names for numbers from 11 to 19 such as Eleven, Twelve, Thirteen, etc. For numbers 21 to 29, start with "Twenty" and then add the unit number. For instance, 27 is written as Twenty-Seven.
Students can make mistakes while learning number names. Let’s discuss a few mistakes a student can make while writing numbers from 11 to 30.
What is the sum of 15 + 5 in words?
Twenty
First, we need to find the sum 15 + 5.
The sum is 20 → 15 + 5 = 20.
We write 20 in words as Twenty.
What is the difference of 30 - 10 in words?
Twenty
We need to find the difference between 30 and 10.
The difference is 20 → 30 - 10 = 20.
Therefore, we write the answer as Twenty.
Find the product of 5 and 3. Write the result in words.
Fifteen
The product is 15 → 5 × 3 = 15.
Hence, 15 in words is Fifteen.
What is (30 ÷ 2) + 10 in words?
Twenty-Five
((30 ÷ 2) + 10) = 15 + 10 = 25.
We find the final result as 25.
Therefore, 25 is written as Twenty-Five.
What is the product of 2 and 14 in words?
Twenty-Eight
The product of 2 and 14 is 28 → 2 × 14 = 28.
So, 28 in words is Twenty-Eight.
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
: She loves to read number jokes and games.