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Q: Is 639 divisible by 9

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1, 3, 9, 71, 213, 639.

No, its not divisible by 8. 639, is an odd numbers with the following divisors: 1, 3, 9, 71, 213, and itself.

1, 2, 3, 6, 9, 18, 71, 142, 213, 426, 639, 1278

603, 612, 621, 630, 639, 648, 657, 666, 675, 684, 693

As 6+9+3=18 and 18 is divisible by 9 then 693 is divisible by 9 693 / 9 = 77 77 = 7 x 11, 7 and 11 are prime numbers Then 693 = 32 x 7 x 11

No, multiples of 6 are even numbers.

1, 639 Then by inspection of the number 639 , we note that each number is a multiple of '3' . So '3' is a factor. Also , slightly more 'tricky'. If we add the digits of 639 ; 6 + 3 + 9 = 18 1 + 8 = 9 . This means that the number has '9' is a factor. NB This only applies to factors/multiples of '9' Finally, divide 639 by 71 and/or 213 . If you have a whole number answer (No decimals), then those numbers are also factors of 639. Hence 639/71 = 9 & 329 / 213 = 3 So allthe given numbers are factors of 639.

639

1 x 639, 3 x 213, 9 x 71, 71 x 9, 213 x 3, 639 x 1

71

1, 3, 9, 71, 213, 639

There are 71(seventy-one) 9's in 639(six hundred thirty-nine.)

639 = 1 x 639, 3 x 213, 9 x 71, 71 x 9, 213 x 3, 639 x 1.

No. Just by looking at it, without working up too much sweat, we can see immediately that it's evenly divisible by 3, 9, 71, and 213.

1, 3, 9, 71, 213, 639.

1, 3, 9, 71, 213, 639.

All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.

639

NO. 1110 is not divisible by 9. A number is divisible by 9 if the sum of its digits is divisible by 9. 1110 = 1 + 1 + 1 + 0 = 3 (3 is not divisible by 9, thus, 1110 is not divisible by 9.)

81: 8 + 1 = 9 which is divisible by 9, so 81 is divisible by 9 162: 1 + 6 + 2 = 9 which is divisible by 9, so 162 is divisible by 9 199: 1 + 9 + 9 = 19 → 1 + 9 = 10 → 1 + 0 = 1 which is not divisible by 9, so 199 is not divisible by 9. 1125: 1 + 1 + 2 + 5 = 9 which is divisible by 9, so 1125 is divisible by 9. So 199 is the only one not divisible by 9.

No - any number divisible by 9 will have the sum of its digits divisible by 9.

639 is a composite number. Its positive integer factors are: 1, 3, 9, 71, 213, 639

71

No... In order for a number to be divisible by 9, the sum of its digits must ALSO be divisible by 9. In this case, 7+0+9+6 = 22. 22 is not divisible by 9 !

345 is not divisible by 9. A quick rule for checking to see if a number is divisible by 9 is to add all of the number's digits. If their sum is divisible by 9, so is the number.2+3+4 = 9, which is divisible by 9, so 234 is divisible by 9. (234/9 = 16)3+4+5 = 123, which is not divisible by 9, so 345 is not divisible by 9 (345/9 = 38 r 3)5+6+7 = 18, which is divisible by 9, so 567 is divisible by 9 (567/9 = 63)