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- A number is divisible by
**2**, when its unit digit is either**Even**or**Zero**. - A number is divisible by
**3**, wehen the**sum**of its digits is divisible by**3**. - A number is divisible by
**4**, when the number formed by the two extreme right end digits is either divisible by**4**or both these digits are**zeroes**. - A number is divisible by
**5,**when its unit digit is either zero or**5.** - A number is divisible by
**6**, when it is divisible bye**2**as well as**3**. - A number is divisible is by
**7**, if it passes the following Test... - Take the last digit in a number.
- Double and subtract the last digit in your number from the rest of the digits.
- Repeat the process for larger numbers.
- Take an Example
**357**(Double the 7 to get 14. Subtract 14 from 35 to get 21 which is divisible by 7 and we can now say that 357 is divisible by 7. - A number is divisible by
**8**, when the number formed by its three extreme right end digits is divisible by**8**or when these last three digits are Zeros. - A number is divisible by
**9**, when the sum of its digits is divisible by**9**. - A number is divisible by
**10**, when its unit digit is**zero**. - A number is divisible by
**11**, when the difference between the sums of the alternate digits is either zero or divisible by**11**. - A number is divisible by
**12**, when it is divisible by**3**as well as**4**. - A number is divisible by
**13**, if sum of 4 times the digit in units place and the number in the remaining part is multiple of**13**. - If the difference of
**5**times the digit in units place and the number in the remaining part is**0**or**multiple**of**17**, then the number is divisible by**17**. - If the sum of
**double**the digit in units place of a given number and number in the remaining part is multiple of**19**, then the given number is divisible of**19**.

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I am teaching maths for children upto std tenth for the past 25 years

ReplyDeletebut i never new the test for divisibility of 7.

thanks

never could have thought..there could be any rules for divisibilty of 7..hats off to u :)

ReplyDeleteyou've explained it much well.thanks :)

ReplyDeletehats off to u mam. great job

ReplyDeletehats off to u mam.

ReplyDeletegr8 work thanks

ReplyDeletegr8 efforts! commendable ,thank you .

ReplyDeleteDivisibilty of 7!! Just fantastic. Thanks a ton.

ReplyDeleteDivisibility for 7. Just Fantastic. Thanks!!

ReplyDeleteDivisibility for Seven. Just Fantastic. Thanks!!

ReplyDeletegreate work, thanks alot

ReplyDeletegreat work, thank u

ReplyDeletepls help me...divisibility of 13 concept

ReplyDeletek k thank you mam...i got it.....i did't read the instructions carefully so only i got confusion ...nw k mam....thank you

ReplyDeletei did not understood the 11 principle

ReplyDelete