If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.

No. To find if a number is a factor of 3, add the number's digits. If the resulting number is a multiple of 3, then the original number is a multiple of 3. In 4339, the digits of the number added together is 19, which is not a multiple of 3.

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If the last two digits of your target number are a multiple of 4, 4 is a factor of the whole number.

Add up the digits of the given number. If they total a multiple of three, the number has three as a factor.

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450 or 900

If that is the case, then three is a factor of the original number.

No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.

21 or 35

Three is.

A factor is what goes into a number, a multiple is what a number goes into. 3 is a factor of 9 27 is a multiple of 9.

No. A number cannot be both a factor and a multiple of another number. A number can be multiple and factor of itself, but nothing else.

The number is 35.

50

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I think you might mean "multiple." If the sum of a number's digits is a multiple of 9, the original number is as well. If you want to know how you know if a number is a factor of 9, memorize the numbers 1, 3 and 9.

65

300, 600 and 900.

They have a converse relationship. A factor is a number that divides into another, with no remainders. A multiple is something that can be multiplied by another number, to reach the original number that you had. Thus: Original number / a factor = a multiple Multiple * (the correct factor) = original number. "the correct factor", because most number have more than one factor. But only one factor * multiple will give the original number.

If 21 is a multiple of the number, the number cannot have 90 as a factor.

If the number is even, it is a multiple of 2 If the sum of the digits make a number divisible by 3, the number is a multiple of 3 If the number ends in 5 or 0, the number is a multiple of 5 If the number is divisible by 2 and 3, the number is a multiple of 6 If the sum of the digits make a number divisible by 9, the number is a multiple of 9

The number is 18, It is even number, it is factor of 198 and multiple of 9

Every number is both a factor and a multiple of itself. Every other factor is smaller than the number, every other multiple is larger than the number.

No. A factor goes into a number. A number goes into a multiple. They have an inverse relationship in the sense that if A is a multiple of B, then B is a factor of A.