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How do you write rational numbers as fractions in simplest form?

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If the rational number is expressed, as a fraction, in the form p/q then find the highest common factor (HCF) of p and q and divide both by the HCF.

Alternatively, find any common factor and divide p and q by that factor. Then repeat with the new ratio. Continue until the HCF is 1.
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To reduce a fraction to its simplest form, find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
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How do you write 0.8 as a mixed number or as a fraction is simplest form?

1/4 * * * * * That is just so wrong. 1/4 is 0.25 NOT 0.8! 0.8 = 8/10 = 4/5 in its simplest form.