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Let's write 0.8 as a fraction.

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So 0.8, the 8 right over here is in the tenths place.

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It is in the tenths place.

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So you can read this as 8 tenths (or 8/10).

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And we can write that, literally,

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as being equal to 8 tenths, or 8 over 10 (or 8/10).

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And now, we've already written it as a fraction.

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And if we want, we can simplify this down.

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Both 8 and 10 share common factors.

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They are both divisible by 2.

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So let's divide both the numerator

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and the denominator by 2.

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We're not changing the value of the fraction,

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because we are dividing both the numerator

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and the denominator by the same thing.

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8 ÷ 2 is 4.

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10 ÷ 2 is 5.

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And we're done.

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0.8 is the same thing as 8 tenths (or 8/10), which is the same thing as 4 fifths (or 4/5).