168 LearnersLast updated on May 26th, 2025
Divisibility Rule of 79
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.
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.
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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.
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
Not following the correct steps.
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.
Mistake 2
Including the last digit in subtraction.
Students should exclude the last digit while subtracting and consider all the remaining digits.
Mistake 3
Not repeating the process when the result is large.
Students often stop the process after getting a large number from subtraction. The process should be repeated until a small number is obtained that can be checked for divisibility by 79.
Mistake 4
Not considering negative values.
Students often ignore negative values, thinking divisibility rules don't apply to them. Divisibility rules apply to negative values as well, so consider negative values as positives when checking divisibility.
Mistake 5
Confusing the steps.
Students often confuse or forget the steps. To avoid errors, students should practice regularly.
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Divisibility Rule of 79 Examples
Problem 1
Is 5531 divisible by 79?
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)
Problem 2
Check the divisibility rule of 79 for 6329.
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.
Problem 3
Is 1581 divisible by 79?
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).
Problem 4
Can 1987 be divisible by 79 following the divisibility rule?
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.
Problem 5
Check the divisibility rule of 79 for 3952.
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).
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FAQs on Divisibility Rule of 79
1.What is the divisibility rule for 79?
2.How many numbers are there between 1 and 1000 that are divisible by 79?
3.Is 316 divisible by 79?
4.What if I get 0 after subtracting?
5.Does the divisibility rule of 79 apply to all integers?
6.How can children in India use numbers in everyday life to understand Divisibility Rule of 79?
7.What are some fun ways kids in India can practice Divisibility Rule of 79 with numbers?
8.What role do numbers and Divisibility Rule of 79 play in helping children in India develop problem-solving skills?
9.How can families in India create number-rich environments to improve Divisibility Rule of 79 skills?
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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.
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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.
