you add up the digits, and if the sum is a multiple of 3, then the number is divisible by 3!
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The third multiple of 3 can be calculated by multiplying 3 by 3, which equals 9. In this case, the third multiple of 3 is 9. In general, to find the nth multiple of a number, you would multiply the number by n.
A multiple of a number is something you get when you multiply that number by another. For instance, 5 x 2 = 10, so 10 is a MULTIPLE of 5 and a MULTIPLE of 2. If you're trying to find a multiple of a number, say, 3, multiply that number by another. It can be any number.
A number that is divisible by 6 but not by 3 must be a multiple of 6 that is not a multiple of 3. Since 6 is a multiple of 3 (6 = 2 * 3), any multiple of 6 will also be a multiple of 3. Therefore, there is no number that is divisible by 6 but not by 3.
Any multiple of 6 is a multiple of 3 and 6.
9 is a multiple of 3. It is 3 x 3.