Number Names 21 to 40
2026-02-28 11:55 Diff
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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 21 to 40.

Number Names 21 to 40

These are the words that we use to represent numbers, which makes them easier to read. Take the number 25, it is written as ‘Twenty-Five’.

Writing numbers in words not only helps us with legal documents and filling forms, but it will also enhance a student's spelling skills.

There are two different ways of naming numbers: the Indian Numbering System and the International Numbering System.

You need to understand how numbers are named in both systems. This will aid in communication as well as arithmetic calculations.

Now, let’s discuss the two numbering systems.

Indian Numbering System

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 34, the digit 4 is in the ones place, and 3 is in the tens place.

Starting from the right, the order goes from ones to tens, hundreds, thousands, ten thousands, lakhs, ten lakhs, and crores. Each digit has its value based on its position in the number.

Let’s take an example of the number 9,56,28,743:

The number gets written as Nine Crore Fifty-Six Lakhs Twenty-Eight Thousand Seven Hundred Forty-Three.

The number gets placed as:
9 in the crores place
5 in the ten lakhs place
6 in the lakhs place
2 in the ten thousands place
8 in the thousands place
7 in the hundreds place
4 in the tens place
3 in the ones place

International Numbering System

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 743,856,269:

The number is written as Seven Hundred Forty-Three Million Eight Hundred Fifty-Six Thousand Two Hundred Sixty-Nine.

The number gets placed as:
7 in the Hundred Million place
4 in the Ten Million place
3 in the Million place
8 in the Hundred Thousands place
5 in the Ten Thousands place
6 in the Thousands place
2 in the Hundreds place
6 in the Tens place
9 in the Ones place

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Number Names 21 to 40 Chart

Learning the names of the numbers from 21 to 40 using a chart will make it easy for students to write the numbers in words. List of Numbers in Words 21 to 40 The list given below shows how numbers from 21 to 40 are written using letters. Learning to write the numbers in words improves skills in reading and writing.

Rules for Writing Numbers from 21 to 40

While writing numbers from 21 to 40, there are certain rules to be followed. Below are some rules to keep in mind while writing the names of numbers.

Rule 1: Always use a hyphen between the tens and ones place. For example, 25 is written as Twenty-Five.

Rule 2: Numbers follow a pattern. For example, 23 is written as Twenty-Three, 27 is written as Twenty-Seven, and 30 is written as Thirty.

Rule 3: The numbers 21 to 29 start with "Twenty", while 30 to 39 start with "Thirty".

Tips and Tricks for Number Names 21 to 40

Always use a hyphen while writing numbers like 25 and 38. It should be written as Twenty-Five and Thirty-Eight. Focus on the tens place for numbers like 21, 22, 23, etc.

After writing "Twenty", just add the number in the ones place. These numbers can be written as Twenty-One, Twenty-Two, and Twenty-Three.

Common Mistakes and How to Avoid Them in Number Names 21 to 40

Students can make mistakes while learning number names. Let’s discuss a few mistakes a student can make while writing numbers from 21 to 40.

Problem 1

What is the sum of 15 + 20 in words?

Okay, lets begin

Thirty-Five

Explanation

First, we need to find the sum 15 + 20

The sum is 35 → 15 + 20 = 35

We write 35 in words as Thirty-Five

Well explained 👍

Problem 2

What is the difference of 40 - 5 in words?

Okay, lets begin

Thirty-Five

Explanation

We need to find the difference between 40 and 5

The difference is 35 → 40 - 5 = 35

Therefore, we write the answer as Thirty-Five

Well explained 👍

Problem 3

Find the product of 5 and 4. Write the result in words

Okay, lets begin

Twenty

Explanation

The product is 20 → 5 × 4 = 20

Hence, 20 in words is Twenty.

Well explained 👍

Problem 4

What is (40 ÷ 2) + 10 in words

Okay, lets begin

Thirty

Explanation

((40 ÷ 2) + 10) = 20 + 10 = 30

We find the final result as 30.

Therefore, 30 is written as Thirty

Well explained 👍

Problem 5

What is the product of 2 and 19 in words?

Okay, lets begin

Thirty-Eight

Explanation

The product of 2 and 19 is 38 → 2 × 19 = 38

So, 38 in words is Thirty-Eight

Well explained 👍

FAQs on Number Names 21 to 40

1.What is the number name of 26?

The number name of 26 is Twenty-Six

2.What is (40 - 8) in words?

The difference is 32. Therefore, 32 in words is Thirty-Two

3.Which is correct for 30: Thirty-One or Thirty?

The correct number name for 30 is Thirty

4.How to write 7891 using the Indian Numbering System?

7891 in the Indian Numbering System is written as Seven Thousand Eight Hundred Ninety-One.

5.What is the number form of 1 billion?

The number form of 1 billion is 1,000,000,000. Here, 1 is followed by nine zeroes.

Important Glossaries for Number Names 21 to 40

  • Place Value: The value of a digit based on its position within a number (e.g., in 23, 3 is in the ones place, 2 in the tens place).

  • Number Form: The numerical form of a number written in words (e.g., Thirty-Four is 34).

  • Hyphen: A punctuation mark used to join two parts of a compound word, such as in "Twenty-Five."

  • Tens Place: The position of a digit two places to the left of the decimal point, representing tens.

  • Ones Place: The position of a digit one place to the left of the decimal point, representing units.

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Hiralee Lalitkumar Makwana

About the Author

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.

Fun Fact

: She loves to read number jokes and games.