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jumpyunicornz
It is composite becuase 85 could be divided my more than one number such as 5.
Kytten
85 is a composite number because it can be divided evenly by a number other than one and itself. Whenever a number ends in 5, you know that it can be divided by 5, so the other factors of 85 besides 1 and 85 are 5 and 17, because 85 / 5 = 17.

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