divisibility rules

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Author:
ddunback
ID:
193275
Filename:
divisibility rules
Updated:
2013-01-16 19:19:00
Tags:
divisibility rules
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Description:
rules 2-13 for divisibility
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  1. If the last digit is even (# ends in a 0,2,4,6, or 8) number is divisible by 
    2
  2. If the sum of the digits is divisible by 3, then the # is also... which number is this 
    3
  3. If the last two digits form a number divisible by 4 then it is also ... which number is this 
    4
  4. If the last digit is 5 or 0 , then the # is divisible by
    5
  5. If the # is divisible by both 3 and 2 (#is even and rule for 3 is satisfied) # is divisible by 
    6
  6. Take last digit double it and subtract that from the rest of the number; if answer is divisible by 7 (including 0) original # is to...what is this #
    7
  7. If last 3 digits form # divisible by 8 then so is the original #... what is the #
    8
  8. If the sum of the digits is divisible by 9 # is to...what is this # 
    9
  9. If # ends in 0 its divisible by 
    10
  10. Alternately add and subtract digits from left to right  include 0. if result is divisible by 11 so is the original #...what is this #
    11
  11. If the # is divisible by both 3 and 4 it is divisible also by
    12
  12. Delete the last digit from # then subtract 9 tines the deleted digit from remaining #, if what is left is divisible by 13 so is the original #...what # is this 
    13

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