520 + 290 = 810
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517% as a decimal is 5.71
517
Divide 7 into 291. If the result is an integer, 7 is a factor.
As you can easily check, it is divisible by 3.As you can easily check, it is divisible by 3.As you can easily check, it is divisible by 3.As you can easily check, it is divisible by 3.
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.