Answer:
4/5
Explanation:
Move the decimal point to the right 2 place values and set the number over 100:
0.8 = 80/100
80/100 can be your answer.
However, most likely you'll have to simplify. Divide common factors from both the numerator & denominator:
(80/100)/(4/4) = 20/25
(20/25)/(5/5) = 4/5
4/5 is your fractional form.
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