Explain why numbers with a 5 in the ones place are not prime numbers

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CariMotten CariMotten

02-08-2015
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Explain why numbers with a 5 in the ones place are not prime numbers

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All of the following expressions have a value between 0 and 1, excepta. \frac{(-3^{7})}{(-3)^9}b. 4^{-10}× 4^{6}c. \frac{(8^3)^3}{8^{-4}} d. ( \frac{2}{5} ^{8})

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RedRicin RedRicin · Answer 1 · 2015-08-02T06:08:11+02:00

RedRicin RedRicin

02-08-2015

If it has a five in the ones place, then it is divisible by 5.
If it is divisible by a number besides 1 or itself, it is not prime.
*exception: 5 is a prime

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