# 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.

**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