Are you tired of always reaching for a calculator to check if a number is divisible by 20? Look no further! In this article, we’ll discuss the divisibility rule for 20 and how you can use it to quickly determine if a number is divisible by 20.

## Divisibility Rule for 20

The divisibility rule for 20 states that a number is divisible by 20 if its last two digits are 0. In other words, if the number ends in 0, it is divisible by 20.

**Let’s take a few examples to understand this rule better.**

- Is 100 divisible by 20? Yes, because the last two digits are 0.
- Is 2,340 divisible by 20? Yes, because the last two digits are 40, which is divisible by 20.
- Is 3,876 divisible by 20? No, because the last two digits are 76, which is not divisible by 20.

As you can see from the examples above, the divisibility rule for 20 is quite straightforward and easy to use.

## How to Use the Divisibility Rule for 20

Using the divisibility rule for 20 is simple. All you need to do is check if the number ends in 0. If it does, then the number is divisible by 20. If it doesn’t, then the number is not divisible by 20.

**Let’s take a few more examples to illustrate this.**

- Is 520 divisible by 20? Yes, because the last two digits are 20, which is divisible by 20.
- Is 357 divisible by 20? No, because the last digit is 7, which is not 0.
- Is 400 divisible by 20? Yes, because the last two digits are 00.

As you can see, using the divisibility rule for 20 is quite simple and can save you a lot of time when working with large numbers.

## Why Does the Divisibility Rule for 20 Work?

The reason why the divisibility rule for 20 works is because 20 is a multiple of 10. Therefore, any number that is divisible by 20 must also be divisible by 10, which means it must end in 0.

## Conclusion

In conclusion, the divisibility rule for 20 states that a number is divisible by 20 if its last two digits are 0. This rule is quite simple to use and can save you a lot of time when working with large numbers. Remember that 20 is a multiple of 10, which is why this rule works.

## FAQs

**Can the divisibility rule for 20 be applied to decimals?**

No, the divisibility rule for 20 only applies to whole numbers.

**Can the divisibility rule for 20 be applied to negative numbers?**

Yes, the divisibility rule for 20 can be applied to negative numbers.

**Is the divisibility rule for 20 the same as the divisibility rule for 10?**

No, the divisibility rule for 10 states that a number is divisible by 10 if it ends in 0, while the rule for 20 requires the number to end in 0 and 0.

**What other divisibility rules are there?**

There are several other divisibility rules, including rules for 2, 3, 4, 5, 6, 8, 9, and 11. Each rule has its own set of guidelines that can be used to quickly determine if a number is divisible by that particular number.

**Why are divisibility rules important?**

Divisibility rules are important because they help us save time when working with large numbers. Instead of performing the actual division, we can quickly determine if a number is divisible by another number by following the appropriate rule.

Overall, the divisibility rule for 20 is a simple and effective way to determine if a number is divisible by 20. By following this rule, you can save time and effort when working with large numbers, making your calculations more efficient. Remember to always check if the last two digits of the number you are working with are 0, and if they are, then the number is divisible by 20.