197 LearnersLast updated on May 26th, 2025
Divisibility Rule of 809
The divisibility rule is a way to find out whether a number is divisible by another number without using the division method. In real life, we can use the divisibility rule for quick math, dividing things evenly, and sorting things. In this topic, we will learn about the divisibility rule of 809.
What is the Divisibility Rule of 809?
The divisibility rule for 809 is a method by which we can determine if a number is divisible by 809 without using the division method. Check whether 1618 is divisible by 809 with the divisibility rule.
Step 1: Double the last digit of the number, here in 1618, 8 is the last digit, so double it. 8 × 2 = 16
Step 2: Subtract the result from Step 1 from the remaining values, excluding the last digit. That is, 161 – 16 = 145.
Step 3: As 145 is not a multiple of 809, the number is not divisible by 809. If the result from step 2 is a multiple of 809, then the number is divisible by 809.
Tips and Tricks for Divisibility Rule of 809
Learning the divisibility rule will help kids master division. Let’s learn a few tips and tricks for the divisibility rule of 809.
Know the multiples of 809:
Memorize the multiples of 809 (809, 1618, 2427, 3236…etc.) to quickly check the divisibility. If the result from the subtraction is a multiple of 809, then the number is divisible by 809.
Use the negative numbers:
If the result we get after the subtraction is negative, we will consider the absolute value for checking the divisibility of a number.
Repeat the process for large numbers:
Students should keep repeating the divisibility process until they reach a small number that is divisible by 809.
For example: Check if 4845 is divisible by 809 using the divisibility test.
Double the last digit, i.e., 5 × 2 = 10
Subtract 10 from the remaining digits excluding the last digit, 484 – 10 = 474
Still, 474 is not a multiple of 809, so 4845 is not divisible by 809.
Use the division method to verify:
Students can use the division method as a way to verify and cross-check their results. This will help them verify and learn.
Common Mistakes and How to Avoid Them in Divisibility Rule of 809
The divisibility rule of 809 helps us quickly check if the given number is divisible by 809, but common mistakes like calculation errors lead to incorrect conclusions. Here we will understand some common mistakes that will help you avoid them.
Mistake 1
Not following the correct steps.
Students should follow the correct steps by doubling the last digit and then subtracting the result from the remaining digits excluding the last digit and checking whether it is a multiple of 809.
Mistake 2
Including the last digit in subtraction.
Students should remember to exclude the last digit while subtracting and include all the remaining digits.
Mistake 3
Not repeating the process when the result is large.
Students often stop the process after obtaining a large number after subtraction. The process should be repeated until we get the smallest number that could be divisible by 809.
Mistake 4
Not considering the negative values.
Students might ignore negative results, thinking divisibility rules don't apply to negative values. But the divisibility rule is applicable for negative values too, so students should consider the absolute value while checking for divisibility.
Mistake 5
Confusing the steps
Students often confuse the steps or forget them. To avoid this error, students should practice regularly.
Divisibility Rule of 809 Examples
Problem 1
Is 8090 divisible by 809?
Yes, 8090 is divisible by 809.
Explanation
To check if 8090 is divisible by 809, we can use the fact that it is a multiple of 809 (8090 = 809 x 10). Therefore, 8090 is divisible by 809.
Problem 2
Check the divisibility rule of 809 for 1618.
Yes, 1618 is divisible by 809.
Explanation
Since 1618 is exactly twice 809 (1618 = 809 x 2), it is divisible by 809.
Problem 3
Is -2427 divisible by 809?
Yes, -2427 is divisible by 809.
Explanation
To check if -2427 is divisible by 809, we remove the negative sign and check 2427. Since 2427 is exactly 3 times 809 (2427 = 809 x 3), it is divisible by 809.
Problem 4
Can 324 be divisible by 809 following the divisibility rule?
No, 324 is not divisible by 809.
Explanation
Since 324 is less than 809 and does not equal 0 when divided by 809, it is not divisible by 809.
Problem 5
Check the divisibility rule of 809 for 6480.
No, 6480 is not divisible by 809.
Explanation
Dividing 6480 by 809 gives a non-integer result, indicating 6480 is not divisible by 809.
FAQs on Divisibility Rule of 809
1.What is the divisibility rule for 809?
2.How many numbers are there between 1 and 5000 that are divisible by 809?
3.Is 2427 divisible by 809?
4.What if I get 0 after subtracting?
5.Does the divisibility rule of 809 apply to all integers?
6.How can children in Oman use numbers in everyday life to understand Divisibility Rule of 809?
7.What are some fun ways kids in Oman can practice Divisibility Rule of 809 with numbers?
8.What role do numbers and Divisibility Rule of 809 play in helping children in Oman develop problem-solving skills?
9.How can families in Oman create number-rich environments to improve Divisibility Rule of 809 skills?
Important Glossaries for Divisibility Rule of 809
- Divisibility rule: A set of rules used to find out whether a number is divisible by another number without performing actual division.
- Multiples: Multiples are the results obtained after multiplying a number by an integer. For example, multiples of 809 are 809, 1618, 2427, 3236, etc.
- Integers: Integers include all whole numbers, negative numbers, and zero.
- Subtraction: Subtraction is the process of finding the difference between two numbers by reducing one number from another.
- Absolute Value: The non-negative value of a number without regard to its sign. For example, the absolute value of -16 is 16.
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About BrightChamps in Oman
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.
