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The answer is actually 4/3, or about 1.333.

Calculators usually can only calculate logarithms in base e (2.718...) and in base 10. To calculate in another base, you use the change-of-base formula; in this case:

log8(16) = log10(16) / log10(8)

Or any other base; for example, using natural logarithms:

log8(16) = ln(16) / ln(8)

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Q: How do you get 1.3 from log8(16) (The 8 is a subscript)?
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