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3 is not a factor of 49. To find out if a 3 is a factor of another number, simply add the digits of the number together to discover if 3 will divide evenly into their sum. If it can, the number is divisible by 3.

For example, for the number 1890, add 1 + 8 + 9 + 0. The answer is 18. 18 is divisible by 3, so 1890 is divisible by 3. If you like, you can carry this out farther and add the digits of 18 together. The answer is 9. 9 is divisible by 3, so 1890 is divisible by 3.

This method works for any number, no matter how many digits it has, to find out if a number is divisible by 3.

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15y ago

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