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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).