Final answer:
To express a rational number in decimal form, divide the numerator by the denominator.
Step-by-step explanation:
To express a rational number in decimal form, you divide the numerator by the denominator. Let's take a look at the given rational numbers:
a) 5/6 = 5 ÷ 6 = 0.8333...
b) 5/9 = 5 ÷ 9 = 0.5555...
In both cases, the division is not exact and the resulting decimal is a repeating decimal. The ellipsis (...) indicates that the digits after the decimal point repeat indefinitely.