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Earn +20 ptsQ: Why number with a 5 in the ones place are not prime numbers?
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Why numbers with a five in the ones place are not prime numbers?
All but the number five are multiples of 5.
Are numbers that have 2 in the ones place composite numbers?
Yes except for 2 on its own which is the only even prime number
Is 9 a prime number when it is in the ones place?
nine is not a prime number
Is all numbers that have a 2 in ones place is a composite?
Yes except for 2 on its own which is the only even prime number.
Is it true or false that all numbers with a 0 in the ones' place are composite numbers?
It is true (as long as there are no decimal places after the ones place) because those numbers will always be divisible by 2, 5, and 10. With exception of the number zero which is neither prime nor composite.
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