Here we will discuss and show you how to figure out which number is a factor of 20, but not a multiple of 81.
The most common way to determine which number is a factor of 20, but not a multiple of 81, is to simply list the factors of 20 and the multiples of 81 so you can compare the two lists.
The answer to "Which number is a factor of 20, but not a multiple of 81?" would be all the numbers that are on the Factors of 20 list, but not on the Multiples of 81 list.
Factors of 20: 1, 2, 4, 5, 10, 20
Multiples of 81: 81, 162, 243, 324, 405...
Answer: 1, 2, 4, 5, 10, 20
Alternatively, you can figure out which number is a factor of 20, but not a multiple of 81, by dividing every factor of 20 by 81. The answer would be all the quotients that are not integers.
Factor, but not a Multiple
You can submit another "Which number is a factor, but not a multiple?" problem below.
Which number is a factor of 21, but not a multiple of 81?
Here is a similar problem in our Multiples database that we have solved for you.