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Q: How could you make 810 divisible by 3?

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Yes.

No, but I suspect you want to know if 810 is divisible by those numbers. Out of that group, 810 is divisible by 2, 3, 5, 6, 9 and 10

Clearly, both 810 and 910 are divisible by 5. A wee trick regarding numbers that are a multiple of 3, is that the component numbers, when added together, are divisible by three. So, 654 is divisible by 3, as 6+5+4 = 15 which is divisible by 3. In your example, 810 components add up to 9, which is divisible by 3. But the components of 910 add up to 10 which is not so divisible.

810/2 = 405 810/3 = 270 * 810/4 = 202.5 810/5 = 162 810/6 = 135 810/9 = 90 810/10 = 81 so 810 is divisible by 2 3 5 6 9 10 but not by 4

No.

Yes. 810 is divisible by these numbers: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810.

no

No

810 is divisible by 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810.

87 is already divisible by 3, so you could add a 0, 3, 6 or 9 anywhere in there and get the same result.

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810

810 = 2 * 3 * 3 * 3 * 3 * 5

1, 4 or 7

Yes; 810 divided by 3 is 270.

no

To find out if 640 is divisible by 3, we will add up the numbers that make 640 as follows: 6 + 4 + 0 = 10 We know that if the sum of the numbers that make up 640 is divisible by 3, then 640 is divisible by 3. Since 10 is NOT divisible by 3, 640 is also NOT divisible by 3. Thus, the answer to the question "Is 640 divisible by 3?" is NO. If you divide 640 by 3, you get 213.3333333.

Any number divisible by 3 has digits that add up to a multiple of 3. Adding a 1 to any of these digits or inserting a 1 anywhere in the number would make it divisible by 3.

The prime factorization of 810 is: 2 x 3 x 3 x 3 x 3 x 5

2 x 3 x 3 x 3 x 3 x 5 = 810

810

2 yes 3 yes 4 no 5 yes 6 yes 9 yes 10 yes

Neither 3 nor 71 are divisible by 9 and nothing will make them so.

It is divisible by 3, for example.It is divisible by 3, for example.It is divisible by 3, for example.It is divisible by 3, for example.

29 is not divisible by 3 and how any digit will alter that depends on how that digit is to interact with 29.