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Which is a composite number 3 5 7 or 9?
9 is a compostie number because it is divisible by 3. A prime number is only divisible by 1 and itself.
Is 646 divisible by 9?
6 + 4 + 6 = 16 1 + 6 = 7 → No; 646 is not divisible by 9 (there is a remainder of 7). ----------------------------------------- Only if the sum of the digits is divisible by 9 is the original number divisible by 9. Repeat the test on the sum until a single digit remains; only if this single digit is 9 is the original number divisible by 9, otherwise this single digit is the remainder when the original number is divided by 9.
Is 705 divisible by 9?
A number is divisible by nine if the sum of the digit foms a number that is multiple of nine table . So this number 705 can be check by like this way : 7+0+5= 12 is not found on the multiplication of nine , so it does not divisible by nine.
Which one is NOT divisible by 9 234 345 or 567?
For each given number, add the digits. If the sum comes to nine, then it is divisible by '9'. 234 ; 2 + 3 + 4 = 9 So is dividble by '9' 345 ; 3 + 4 + 5 = 12 = 1 + 2 = 3 Not divisible by '9' 567 ; 5 + 6 + 7 = 18 = 1 + 8 = 9 so is divisible by '9'.
Why any number that is divisible by 9 is also divisible by 3?
as 9 is made of 3 times 3 so any number (such as 90) which is divisible by 9 will also be divisible by 3 and the answer will be 3 times bigger so 90/9 is 10 then 90/3 = 30 which is 10 x 3 Example: same for any number that is divisible by 14 will also be divisible by 7 (or also 2) as 14 = 7 x 2 or divisible by say 50 is also divisible by 5 or 10 as 50 = 5 x 10 and so on ...
