# Lesson Worksheet: Common Factors Mathematics • 4th Grade

In this worksheet, we will practice finding the common factors of two or three whole numbers by listing their factors.

Q1:

Which number is a factor of 12 and a factor of 33? Q2:

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

• A3
• B15
• C13
• D10
• E2

Q3:

Farida claims that any two numbers have the common factor 1. Is she right?

• ANo
• BYes

Q4:

Noah claims that zero is a factor of only one number, which is the zero itself. Is this true?

• AYes
• BNo

Q5:

Which of the following numbers have the common factors 1, 3, and 5?

• A8, 15
• B15, 25
• C20, 30
• D15, 20
• E15, 30

Q6:

Are all factors of 9 also factors of 18?

• ANo
• BYes

Q7:

Find the common factors of the numbers 27 and 90.

• A3, 9
• B1, 2, 3, 6, 9, 18
• C1, 3, 9
• D1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 90

Q8:

True or False: There are no common factors between 17 and 59.

• AFalse
• BTrue

Q9:

Which of these pairs of numbers has a common factor of 2?

• A24 and 28
• B28 and 27
• C24 and 21
• D24 and 27
• E21 and 27

Q10:

True of False: 5 is not a common factor of 24 and 36.

• AFalse
• BTrue