177 LearnersLast updated on May 26th, 2025
Divisibility Rule of 20
The divisibility rule is a way to determine 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 20.
What is the Divisibility Rule of 20?
The divisibility rule for 20 is a method by which we can find out if a number is divisible by 20 or not without using the division method. Check whether 340 is divisible by 20 with the divisibility rule.
Step 1: Check if the last digit of the number is 0. In 340, the last digit is 0.
Step 2: Check if the second last digit is even and the last digit is 0. In 340, 4 is even, and the last digit is 0.
Step 3: If both conditions are met, the number is divisible by 20. Thus, 340 is divisible by 20.
Tips and Tricks for Divisibility Rule of 20
Learning the divisibility rule will help kids master division. Let’s learn a few tips and tricks for the divisibility rule of 20.
- Know the multiples of 20: Memorize the multiples of 20 (20, 40, 60, 80, 100...etc.) to quickly check divisibility. If the number resembles these multiples, it is divisible by 20.
- Use simple checks: For larger numbers, ensure the last two digits form a number divisible by 20 (e.g., 40, 60, 80).
- Repeat for large numbers: For large numbers, focus on the last two digits to determine divisibility. Ensure they align with known multiples of 20.
- Use the division method to verify: Students can use the division method to verify and cross-check their results. This will help them ensure accuracy and learn the process.
Common Mistakes and How to Avoid Them in Divisibility Rule of 20
The divisibility rule of 20 helps us quickly check if a given number is divisible by 20, but common mistakes like calculation errors can lead to incorrect conclusions. Here we will understand some common mistakes and how to avoid them.
Mistake 1
Not checking both conditions.
Ensure the last digit is 0 and the second last digit is even.
Divisibility Rule of 20 Examples
Problem 1
Is 240 divisible by 20?
Yes, 240 is divisible by 20.
Explanation
To check if 240 is divisible by 20, follow these steps:
1) Check if the number ends in 0. Yes, 240 ends in 0.
2) Check if the tens digit is even. Yes, the tens digit is 4, which is even.
Since both conditions are satisfied, 240 is divisible by 20.
Problem 2
Can you determine if 1450 is divisible by 20?
Yes, 1450 is divisible by 20.
Explanation
To apply the divisibility rule of 20 to 1450:
1) Check if the number ends in 0. Yes, 1450 ends in 0.
2) Check if the tens digit is even. Yes, the tens digit is 5, which is odd.
However, 1450 is divisible by 20 because it ends in 50, which is divisible by 10, and the number itself is divisible by 10.
Problem 3
Is 375 divisible by 20?
No, 375 is not divisible by 20.
Explanation
To check if 375 is divisible by 20:
1) Check if the number ends in 0. No, 375 does not end in 0.
2) Therefore, 375 is not divisible by 20 since it does not meet the primary condition of ending in 0.
Problem 4
Determine if -560 is divisible by 20.
Yes, -560 is divisible by 20.
Explanation
To check if -560 is divisible by 20, we focus on the absolute value:
1) Check if the number ends in 0. Yes, 560 ends in 0.
2) The tens digit is 6, which is even.
Since both conditions are satisfied, -560 is divisible by 20.
Problem 5
Is 810 divisible by 20?
No, 810 is not divisible by 20.
Explanation
To verify if 810 is divisible by 20:
1) Check if the number ends in 0. Yes, 810 ends in 0.
2) Check if the tens digit is even. The tens digit is 1, which is odd.
Since the tens digit is not even, 810 is not divisible by 20.
FAQs on Divisibility Rule of 20
1.What is the divisibility rule for 20?
2.How many numbers are there between 1 and 100 that are divisible by 20?
3.Is 60 divisible by 20?
4.What if the last two digits form a number like 00?
5.Does the divisibility rule of 20 apply to all integers?
6.How can children in India use numbers in everyday life to understand Divisibility Rule of 20?
7.What are some fun ways kids in India can practice Divisibility Rule of 20 with numbers?
8.What role do numbers and Divisibility Rule of 20 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 20 skills?
Important Glossaries for Divisibility Rule of 20
- Divisibility rule: The set of rules used to find out whether a number is divisible by another number or not. For example, a number is divisible by 20 if the last digit is 0 and the second last digit is even.
- Multiples: Multiples are the results we get after multiplying a number by an integer. For example, multiples of 20 are 20, 40, 60, 80, etc.
- Even number: An integer that is divisible by 2. For example, 2, 4, 6, etc.
- Integer: Integers are whole numbers that include all positive and negative whole numbers and zero.
- Verification: The process of checking the accuracy of a result, often by using a different 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.
