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December 29, 2011

Divisibility Rules

15 comments

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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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15 comments:

  1. I am teaching maths for children upto std tenth for the past 25 years
    but i never new the test for divisibility of 7.
    thanks

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

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  3. you've explained it much well.thanks :)

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  4. hats off to u mam. great job

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  5. gr8 efforts! commendable ,thank you .

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  6. Divisibilty of 7!! Just fantastic. Thanks a ton.

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  7. Divisibility for 7. Just Fantastic. Thanks!!

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  8. Divisibility for Seven. Just Fantastic. Thanks!!

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  9. pls help me...divisibility of 13 concept

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

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  11. i did not understood the 11 principle

    ReplyDelete

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