**Basic divisibility rules of numbers.**

**Can you still recall what your primary teacher taught you about divisibility rules of numbers? If your answer is no, then here’s an easy refresher course about the subject matter.**

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If a number can be divided exactly by another number without any remainder, then we say:

The first number is divisible by the second and the second number divides the first.

**1. Divisibility by 2**

**Even numbers with units digit of 0, 2, 4, 6, or 8 are divisible by 2.****2. Divisibility by 3**

*A number is divisible by 3 if the sum of the digits of the number is divisible by 3.***Example: 8,247 is divisible by 3 because 8 + 2 + 4 + 7 = 21, and 21 is divisible by 3.**

**3. Divisibility by 4**

*If the last two digits of a number form a number that is divisible by 4, then the number is divisible by 4.***Note: Any number whose last two digits is 00 is considered to be divisible by 4.**

**Example 924: The last two digits in this number (2 and 4) is divisible by 4, so 924 is divisible by 4.**

**4. Divisibility by 5**

*If the last digit or units of a number is 0 or 5, then the number is divisible by 5.***5. Divisibility by 6**

**A number is divisible by 6 if the number is divisible by both 2 and 3. Or, any even number divisible by 3 is also divisible by 6.****6. Divisibility by 8**

*A number is divisible by 8 if the number formed by the last 3 digits is divisible by 8.***Example: 5,280 is divisible by 8 since the last 3 digits of the number (280) is divisible by 8.**

**7. Divisibility by 9**

**A number is divisible by 9 if the sum of the digits is divisible by 9.****Example: 1,545 is divisible by 9 since 1 + 5 +4 + 5 = 18, and 18 is divisible by 9.**

**8. Divisibility by 10**

*A number is divisible by 10 if the last digit or units digit is 0.***9. Divisibility by 11**

*A number is divisible by 11 if the difference between the sums of the digits in the odd places and the digits in the even places is either 0 or a multiple of 11.***Example: 8,591,726 is divisible by 11 since 8 + 9 + 7 + 6 = 30 and 5 + 1 + 2 = 8 30 – 8 = 22 (a multiple of 11).**

Pag ganito ang problem KUya, nahkakamigraine ako hahaha. That's my husbad cup of tea not mine weee.

ReplyDeleteThis is a clever way to teach math... I lose and totally forget about math after I graduated but through this formula it will help me solve problems.

ReplyDeleteI honestly am not good at math...lol! very clever it is!

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