Multiply any number by nine and you'll have a factor of nine.
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1, 3 and 9 are the only integers that can divide into 9 evenly with no remainder.
2, 3, 6, 9
The greatest proper factor for 27 would be 9. 9 x 3=27. 27 is a factor of itself, but since we are talking about proper factors we exclude it.
Proper factors occur when you list all the factors of a number except for 1 and the number itself. Common factors occur when you compare a minimum of two sets of factors and see which ones they share.
No, no prime number has proper factors.
24 has eight factors, which means it has six proper factors.