9.524 of course is 9 524/1000, but this is not in lowest terms because 524 and 1000 both are divisible by 4. Dividing both by 4 we get 9 131/250. The only prime factors of 250 are 2 and 5, neither of which divides 131, so this is now in lowest terms.
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As a fraction in its lowest terms: 67/100
Divide till you cant divide evenly
8.2 = 82/10 = 81/5.
As an improper fraction it is 13/2, as a mixed number it is 6 1/2
The lowest term has already been reduced as far as it will go. It is not possible to reduce it further.