All numbers whose digits finally add up to 9 are divisible by 9 as for example 81 => 8+1 is 9 and so 81 is divisible by 9
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9. always 9.
9+0=9?
9-9
3 and 9 are both 'natural' numbers.
The multiples of 9 are numbers that can be divided evenly by 9. The two prime numbers closest to a multiple of 9 are 7 and 11. Since 9 is between 7 and 11, the multiple of 9 that is in between these two prime numbers is 9 itself.