Here we will discuss and show you how to figure out which number is a factor of 90, but not a multiple of 20.
The most common way to determine which number is a factor of 90, but not a multiple of 20, is to simply list the factors of 90 and the multiples of 20 so you can compare the two lists.
The answer to "Which number is a factor of 90, but not a multiple of 20?" would be all the numbers that are on the Factors of 90 list, but not on the Multiples of 20 list.
Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Multiples of 20: 20, 40, 60, 80, 100...
Answer: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Alternatively, you can figure out which number is a factor of 90, but not a multiple of 20, by dividing every factor of 90 by 20. 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 91, but not a multiple of 20?
Here is a similar problem in our Multiples database that we have solved for you.