Worksheet: Finding the Common Factors of Multiple Numbers

In this worksheet, we will practice finding the common factors or any two or more positive numbers by factoring them, listing these factors, and seeing which of them are common to all the numbers.

Q1:

Which of the following numbers is not a common factor of 60 and 90?

Q2:

Which of the following numbers is not a common factor of 36 and 90?

Q3:

Which of the following numbers is not a common factor of 84 and 96?

Q4:

We know that . Pick the true statement.

A4 is a multiple of 20.
B20 is a factor of 5.
C20 is a multiple of 5.
D5 is a multiple of 20.
E20 is a factor of 4.

Q5:

Which number is a factor of 12 and a factor of 33?