Question

What digits can be in the ones place of a number that has 5 as a factor

Answer 1

C'mon.
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We know how to do this!
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Multiply 5 by ANY number you want!!
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I say infinity.
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Actually thats impossible.
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Ok, 8.
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Ones digit?
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40, so it's 0.
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How about multiply by 2 and 3^2? (18)
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90, so 0.
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See?
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Easy as pi.
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Hope I helped!
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Any questions, ask away!