Medium
Which type of decimal expansion does the rational number 8/20 have?
Explanation
Explanation
A fraction has a terminating decimal expansion exactly when the denominator (in lowest terms) has no prime factors other than 2 and 5. Here 20 = 2 × 2 × 5, so 8/20 = 0.4 terminates.
PRO TIP
Re-check your working by substituting the answer back into the original question.