Is 78 divisible by 6 and 9?

Answer 1

Using the tests for divisibility:

• Divisible by 3:

Add the digits and if the sum is divisible by 3, so is the original number:

6 + 8 + 4 = 18 which is divisible by 3, so 684 is divisible by 3

• Divisible by 6:

Number is divisible by 2 and 3:

• Divisible by 2:

If the number is even (last digit divisible by 2), then the whole number is divisible by 2.

684 is even so 684 is divisible by 2.

• Divisible by 3:

Already shown above to be divisible by 3.

684 is divisible by both 2 & 3 so 684 is divisible by 6

• Divisible by 9:

Add the digits and if the sum is divisible by 9, so is the original number:

6 + 8 + 4 = 18 which is divisible by 9, so 684 is divisible by 9

Thus 684 is divisible by all 3, 6 & 9.

Answer 2

378 is divisible by both 3 and 9 with no remainders

Answer 3

6 yes

168 / 6 = 28

9 no

either 18 x 9 = 162

or 19 x 9 = 171

Answer 4

6 yes, 9 no.

Answer 5

3 yes, 9, no.

Answer 6

No, it is not divisible by 9.

Answer 7

No, it is not divisible by 6 and 9.

Answer 8

All but 4.