Final answer:
The factors of 28 are 1, 2, 4, 7, 14, and 28; the factors of 18 are 1, 2, 3, 6, 9, and 18; and the factors of 6 are 1, 2, 3, and 6.
Step-by-step explanation:
To find all the unique factors of a number, you need to find all the numbers that divide it without leaving a remainder. Here's how to find them for each number given:
28: The factors are 1, 2, 4, 7, 14, and 28.
18: The factors are 1, 2, 3, 6, 9, and 18.
6: The factors are 1, 2, 3, and 6.
To determine the list of factors for each number, we look for divisors starting from 1 up to the square root of the number. If a number evenly divides, you can also determine its corresponding factor pair. For example, 2 is a factor of 28 because 28 divided by 2 is 14, which means 14 is also a factor.