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Q: How would you test whether 7 is a factor?

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Divide 7 into 291. If the answer is an integer, 7 is a factor.

Divide 7 into 291. If the answer is an integer, it's a factor.

Divide it. It isn't.

Divide 7 into 29. If the answer is an integer with no remainder, it's a factor.

I would divide it. It doesn't come out even. It's not a factor.

Divide 7 into 291. If the result is an integer, 7 is a factor.

Divide 7 into 291. If the answer is an integer, it's a factor.

7 doesn't have an easy test. But when I see that 291 is made up of 280 + 11, I know that 7 is not a factor.

There isn't an easy test for 7. You have to divide it. 7 is not a factor of 291.

Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.

Divide 291 by 7 and see if you get a whole number or is there a remainder. If it is not a whole number, then it is not a factor. 7 goes into 291 41 times with a remainder of 4, so it is not a factor.

Since 4 x 7 is 28, you know that 7 isn't a factor of 29. Since 29 is a prime number, you know that 7 isn't a factor of it. To be perfectly sure, divide 7 into 29. If the answer is an integer, it's a factor.

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