Final answer:
If the denominator of a fraction has '2' or '5' or both '2' and '5' as its only prime factors, its decimal form is a terminating decimal.
Step-by-step explanation:
If the denominator of a fraction has '2' or '5' or both '2' and '5' as its only prime factors, its decimal form is a terminating decimal. A terminating decimal is a decimal number that ends after a finite number of digits. It does not repeat or continue indefinitely.