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Q: What number am I I am a multiple of 7 and a factor of 210. The product of my two digits is odd. What number am I?

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The number is 35.

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

A multiple is a product of that number and any other non-zero integer.

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

450 or 900

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.

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

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

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

150

The greatest number is 7.

12

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