167 LearnersLast updated on May 26th, 2025
Divisibility Rule of 80
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 80.
What is the Divisibility Rule of 80?
The divisibility rule for 80 is a method by which we can find out if a number is divisible by 80 or not without using the division method. Check whether 2880 is divisible by 80 with the divisibility rule.
Step 1: Check if the number ends with two zeros or can be divided by 4 and 20. In 2880, the last digit is 0.
Step 2: Divide the last two digits by 4. Here, 80 ÷ 4 = 20.
Step 3: Since 20 is a multiple of 20, the number 2880 is divisible by 80. If the result from step 2 isn't a multiple of 20, then the number isn't divisible by 80.
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Tips and Tricks for Divisibility Rule of 80
Learning the divisibility rule will help kids master division. Let’s learn a few tips and tricks for the divisibility rule of 80.
Know the multiples of 80:
Memorize the multiples of 80 (80, 160, 240, 320…etc.) to quickly check divisibility. If the result from the division is a multiple of 20, then the number is divisible by 80.
Use the divisibility rules for 4 and 20:
If a number is divisible by both 4 and 20, then it is divisible by 80.
Repeat the process for large numbers:
Students should keep repeating the divisibility process until they reach a small number that confirms divisibility by 80. For example: Check if 5760 is divisible by 80 using the divisibility test. Divide the last two digits by 4: 60 ÷ 4 = 15. Since 15 is not a multiple of 20, 5760 is not divisible by 80.
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 also learn.
Common Mistakes and How to Avoid Them in Divisibility Rule of 80
The divisibility rule of 80 helps us quickly check if a given number is divisible by 80, but common mistakes like calculation errors lead to incorrect calculations. Here we will understand some common mistakes that will help you to understand.
Mistake 1
Not following the correct steps.
Students should follow the correct steps, such as checking divisibility by 4 and 20 and then verifying if it is a multiple of 80.
Mistake 2
Forgetting to check both conditions of divisibility.
Students should remember to check both conditions: divisibility by 4 and divisibility by 20.
Mistake 3
Not repeating the process when the result is large.
Students often stop the process after they have a large number after division. The process should be repeated until we get confirmation of divisibility by 80.
Mistake 4
Confusing the steps.
Students often confuse the steps or forget them; to avoid the error, students should practice regularly.
Mistake 5
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.
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Divisibility Rule of 80 Examples
Problem 1
Can a shipment of 320 boxes be divided equally among 80 trucks?
Yes, 320 can be divided equally among 80 trucks.
Explanation
To determine if 320 is divisible by 80, check if it can be divided without a remainder: 320 ÷ 80 = 4.
Since the result is a whole number, 320 is divisible by 80.
Problem 2
Is the number 640 divisible by 80?
Yes, 640 is divisible by 80.
Explanation
For 640 to be divisible by 80, calculate 640 ÷ 80 = 8.
The result is a whole number, indicating that 640 is divisible by 80.
Problem 3
Can a total of 560 apples be packed into bags containing 80 apples each?
Yes, 560 apples can be packed into bags containing 80 apples each.
Explanation
Check if 560 is divisible by 80: 560 ÷ 80 = 7.
The result is a whole number, so 560 is divisible by 80.
Problem 4
Is the number 150 divisible by 80?
No, 150 is not divisible by 80.
Explanation
To check if 150 is divisible by 80, calculate 150 ÷ 80 = 1.875.
Since the result is not a whole number, 150 is not divisible by 80.
Problem 5
Can 800 pages be divided equally among 80 chapters?
Yes, 800 pages can be divided equally among 80 chapters.
Explanation
Determine if 800 is divisible by 80 by calculating 800 ÷ 80 = 10.
The result is a whole number, so 800 is divisible by 80.
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FAQs on Divisibility Rule of 80
1.What is the divisibility rule for 80?
2.How many numbers are there between 1 and 1000 that are divisible by 80?
3.Is 640 divisible by 80?
4.What if I get 0 after division by 4?
5.Does the divisibility rule of 80 apply to all integers?
6.How can children in United States use numbers in everyday life to understand Divisibility Rule of 80?
7.What are some fun ways kids in United States can practice Divisibility Rule of 80 with numbers?
8.What role do numbers and Divisibility Rule of 80 play in helping children in United States develop problem-solving skills?
9.How can families in United States create number-rich environments to improve Divisibility Rule of 80 skills?
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Important Glossaries for Divisibility Rule of 80
- Divisibility rule: The set of rules used to find out whether a number is divisible by another number or not.
- Multiples: Multiples are the results we get after multiplying a number by an integer. For example: multiples of 80 are 80, 160, 240, 320, etc.
- Integer: Integers are numbers that include all whole numbers, negative numbers, and zero.
- Division: Division is a mathematical operation where a number is divided by another to find the quotient.
- Quotient: The result obtained when one number is divided by another.
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About BrightChamps in United States
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.
