explain why 3×5×7×+7 is a composite number
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3×5×7+7 can also be written as
7(3×5+1)
Therefore the following number has one of its factors 7 or is a multiple of 7.
As composite number have more than two factors (including 1 and the number itself)
3×5×7+7 is a composite number
7(3×5+1)
Therefore the following number has one of its factors 7 or is a multiple of 7.
As composite number have more than two factors (including 1 and the number itself)
3×5×7+7 is a composite number
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