On this post I am going to tell you the divisibility rules for 3,9 and 6.
Rule for 3: To find out if a number is divisible by 3, you must add the digits of the number you have in mind together. Then if 3 is a factor of the sum, the whole number is divisible by 3.
(ex. 1821- 1+8+2+1=12- 3 is a factor of 12 so 1821 is divisible by 3).
Rule for 9: (Same as the rule for 3). To find out if a number is divisible by 9, you must add the digits of the number together. Then if 9 is a factor of the sum, the whole number is divisible by 9
(ex. 3726- 3+7+2+6=18 9 is a factor of 18 so 3726 is divisible by 9).
Rule for 6: For a number to be divisible by 6 the number must be divisible by both 2 and 3 as well. Which means it must be even and you must add the digits of the number together and see if its divisible by 3.
(ex. 9144-Even-divisible by 2
(9+1+4+4= 18- divisible by 3)---> 9144 is divisible by 6
Rule for 3: To find out if a number is divisible by 3, you must add the digits of the number you have in mind together. Then if 3 is a factor of the sum, the whole number is divisible by 3.
(ex. 1821- 1+8+2+1=12- 3 is a factor of 12 so 1821 is divisible by 3).
Rule for 9: (Same as the rule for 3). To find out if a number is divisible by 9, you must add the digits of the number together. Then if 9 is a factor of the sum, the whole number is divisible by 9
(ex. 3726- 3+7+2+6=18 9 is a factor of 18 so 3726 is divisible by 9).
Rule for 6: For a number to be divisible by 6 the number must be divisible by both 2 and 3 as well. Which means it must be even and you must add the digits of the number together and see if its divisible by 3.
(ex. 9144-Even-divisible by 2
(9+1+4+4= 18- divisible by 3)---> 9144 is divisible by 6
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