BrightChamps Logo
Hamburger Menu Icon for BrightChamps Website Navigation
Login
Creative Math Ideas Image
Live Math Learners Count Icon128 Learners

Last updated on May 26th, 2025

Math Whiteboard Illustration

Divisibility Rule of 79

Professor Greenline Explaining Math Concepts

The divisibility rule is a way to determine whether a number is divisible by another number without performing actual division. In real life, we can use the divisibility rule for quick math, dividing things evenly, and sorting items. In this topic, we will learn about the divisibility rule of 79.

Divisibility Rule of 79 for Indian Students
Professor Greenline from BrightChamps

What is the Divisibility Rule of 79?

The divisibility rule for 79 is a method to find out if a number is divisible by 79 without using division. Check whether 6321 is divisible by 79 using the divisibility rule.  


Step 1: Multiply the last digit of the number by 23, here in 6321, 1 is the last digit. Multiply it by 23. 1 × 23 = 23.  


Step 2: Subtract the result from Step 1 from the remaining number without the last digit. i.e., 632–23 = 609.  


Step 3: Check if 609 is a multiple of 79. Since it is not, 6321 is not divisible by 79. If the result from step 2 is a multiple of 79, then the number is divisible by 79.

divisibility rule of 79

Professor Greenline from BrightChamps

Tips and Tricks for Divisibility Rule of 79

Learning the divisibility rule helps kids master division. Let’s learn a few tips and tricks for the divisibility rule of 79.

 

Know the multiples of 79:

Memorize the multiples of 79 (79, 158, 237, etc.) to quickly check divisibility. If the result from the subtraction is a multiple of 79, then the number is divisible by 79.


 

Use negative numbers:

If the result after subtraction is negative, ignore the negative sign and consider it as positive for checking divisibility.


 

Repeat the process for large numbers:

Students should keep repeating the divisibility process until they reach a small number that can be checked for divisibility by 79.  

For example: Check if 15842 is divisible by 79 using the divisibility test.  Multiply the last digit by 23, i.e., 2 × 23 = 46.  

Subtract 46 from the remaining digits, excluding the last digit: 1584–46 = 1538.  

Repeat the process: 8 × 23 = 184.  Subtract 184 from the remaining digits, excluding the last digit: 153–184 = -31.  

Since -31 is not a multiple of 79, 15842 is not divisible by 79.


 

Use the division method to verify:

Students can use the division method to verify and cross-check their results. This will help them confirm their understanding.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in Divisibility Rule of 79

The divisibility rule of 79 helps us quickly check if a given number is divisible by 79, but common mistakes like calculation errors can lead to incorrect conclusions. Here we will identify some common mistakes and how to avoid them.

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Not following the correct steps.

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

Students should follow the correct steps: multiplying the last digit by 23, then subtracting the result from the remaining digits, excluding the last digit, and checking whether it is a multiple of 79.

Max from BrightChamps Saying "Hey"

Divisibility Rule of 79 Examples

Ray, the Character from BrightChamps Explaining Math Concepts
Max, the Girl Character from BrightChamps

Problem 1

Is 5531 divisible by 79?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Yes, 5531 is divisible by 79.

Explanation

To check if 5531 is divisible by 79, use the following steps:


1) Double the last digit of the number, 1 × 2 = 2.


2) Subtract this from the remaining number, 553 - 2 = 551.


3) Check if 551 is a multiple of 79. Yes, 551 is a multiple of 79 (79 × 7 = 553)

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 2

Check the divisibility rule of 79 for 6329.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

No, 6329 is not divisible by 79.

Explanation

To determine if 6329 is divisible by 79, follow these steps:


1) Double the last digit, 9 × 2 = 18.


2) Subtract this from the remaining number, 632 - 18 = 614.


3) Check if 614 is a multiple of 79. No, 614 is not a multiple of 79.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 3

Is 1581 divisible by 79?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Yes, 1581 is divisible by 79.

Explanation

To verify if 1581 is divisible by 79, proceed as follows:


1) Double the last digit, 1 × 2 = 2.


2) Subtract this from the remaining number, 158 - 2 = 156.


3) Check if 156 is a multiple of 79. Yes, 156 is a multiple of 79 (79 × 2 = 158).

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 4

Can 1987 be divisible by 79 following the divisibility rule?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

o, 1987 is not divisible by 79.

Explanation

To check if 1987 is divisible by 79, follow these steps:


1) Double the last digit, 7 × 2 = 14.


2) Subtract this from the remaining number, 198 - 14 = 184.


3) Check if 184 is a multiple of 79. No, 184 is not a multiple of 79.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 5

Check the divisibility rule of 79 for 3952.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Yes, 3952 is divisible by 79.

Explanation

To confirm if 3952 is divisible by 79, use the following steps:


1) Double the last digit, 2 × 2 = 4.


2) Subtract this from the remaining number, 395 - 4 = 391.


3) Check if 391 is a multiple of 79. Yes, 391 is a multiple of 79 (79 × 5 = 395).

Max from BrightChamps Praising Clear Math Explanations
Ray Thinking Deeply About Math Problems

FAQs on Divisibility Rule of 79

1.What is the divisibility rule for 79?

Math FAQ Answers Dropdown Arrow

2.How many numbers are there between 1 and 1000 that are divisible by 79?

Math FAQ Answers Dropdown Arrow

3.Is 316 divisible by 79?

Math FAQ Answers Dropdown Arrow

4.What if I get 0 after subtracting?

Math FAQ Answers Dropdown Arrow

5.Does the divisibility rule of 79 apply to all integers?

Math FAQ Answers Dropdown Arrow

6.How can children in India use numbers in everyday life to understand Divisibility Rule of 79?

Math FAQ Answers Dropdown Arrow

7.What are some fun ways kids in India can practice Divisibility Rule of 79 with numbers?

Math FAQ Answers Dropdown Arrow

8.What role do numbers and Divisibility Rule of 79 play in helping children in India develop problem-solving skills?

Math FAQ Answers Dropdown Arrow

9.How can families in India create number-rich environments to improve Divisibility Rule of 79 skills?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for Divisibility Rule of 79

  • Divisibility rule: A set of rules used to determine whether a number is divisible by another number without performing division.

 

  • Multiples: The results obtained by multiplying a number by an integer. For example, multiples of 79 are 79, 158, 237, etc.

 

  • Integers: Numbers that include all whole numbers, negative numbers, and zero.

 

  • Subtraction: The process of finding the difference between two numbers by reducing one from another.

 

  • Verification: The process of confirming the correctness of a result, often by using an alternative method such as division.
Professor Greenline from BrightChamps

About BrightChamps in India

At BrightChamps, we see numbers as more than just figures—they are a gateway to endless possibilities! Our mission is to support children all over India in building strong math skills, with today’s focus on the Divisibility Rule of 79 and special attention to understanding the Divisibility Rule—in a way that’s engaging, enjoyable, and easy to follow. Whether your child is calculating the speed of a train, keeping score during a Cricket match, or managing their pocket money to buy the latest gadgets, knowing numbers gives them confidence for daily life. Our interactive lessons keep learning simple and fun. As children in India have varied learning styles, we personalize our teaching to suit each child. From the bustling markets of Mumbai to the vibrant streets of Delhi, BrightChamps makes math relatable and exciting throughout India. Let’s make the Divisibility Rule a joyful part of every child’s math experience!
Math Teacher Background Image
Math Teacher Image

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.

Math Teacher Fun Facts Image
Max, the Girl Character from BrightChamps

Fun Fact

: She loves to read number jokes and games.

INDONESIA - Axa Tower 45th floor, JL prof. Dr Satrio Kav. 18, Kel. Karet Kuningan, Kec. Setiabudi, Kota Adm. Jakarta Selatan, Prov. DKI Jakarta
INDIA - H.No. 8-2-699/1, SyNo. 346, Rd No. 12, Banjara Hills, Hyderabad, Telangana - 500034
SINGAPORE - 60 Paya Lebar Road #05-16, Paya Lebar Square, Singapore (409051)
USA - 251, Little Falls Drive, Wilmington, Delaware 19808
VIETNAM (Office 1) - Hung Vuong Building, 670 Ba Thang Hai, ward 14, district 10, Ho Chi Minh City
VIETNAM (Office 2) - 143 Nguyễn Thị Thập, Khu đô thị Him Lam, Quận 7, Thành phố Hồ Chí Minh 700000, Vietnam
Dubai - BrightChamps, 8W building 5th Floor, DAFZ, Dubai, United Arab Emirates
UK - Ground floor, Redwood House, Brotherswood Court, Almondsbury Business Park, Bristol, BS32 4QW, United Kingdom