Every number that is a multipal of nine, the total sum of the numbers will equal nine or be a multipal of nine. Example 18....1+8=9.........27....2+7=9..........261...2+6+1=9.........3690....3+6+9+0=18...1+8=9
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No. To check divisibility by nine, sum the digits. If they add up to 9 (or a multiple of 9) then the number is divisible by 9. This trick works for 9 divisibility and 3 divisibility. In this problem: 3 + 0 + 9 + 1 = 13, which is not divisible by 9. Suppose the number was 3591: 3+5+9+1=18, which is divisible by 9 (you can check 1+8=9). You can keep summing the digits of the new numbers till you get to a number which is either 9 or some other number. (If it's 3 or 6, then the number is divisible by 3)
If the digit sum of a number is 9 then it is divisible by 9
3 and 9. And they divide into 123456789 whether or not you use divisibility rules!
No.
Its digits add up to 9 so therefore it is divisible by 9