Answer: 9.14
Step-by-step explanation: To determine which number is the least among 9.14, 90.14, and 9.4, we can compare the whole numbers first. Among 9, 90, and 9, we can see that 9 is the least. Next, compare the decimal parts of the numbers: 0.14, 0.14, and 0.4. Here, we can observe that 0.14 is equal to both 9.14 and 90.14, but 0.4 is greater. Therefore, the number 9.14 is the least among the given options because it has the smallest whole number part and the smallest decimal part.