Greatest Common Divisor (GCD) Worksheet

Greatest Common Divisor (GCD) Worksheet

Read each question carefully and determine the Greatest Common Divisor (GCD) for the given numbers. Show your work where indicated.

1. List all the divisors for each number:

a) 18:  

b) 24:  

c) 30:  

2. Find the Greatest Common Divisor (GCD) for each pair of numbers:

a) GCD (12, 18) =  

b) GCD (20, 25) =  

c) GCD (15, 35) =  

d) GCD (16, 24) =  

3. Which of the following is the GCD of 36 and 48?

4. A baker has 40 chocolate chip cookies and 32 oatmeal cookies. She wants to package them into boxes so that each box has the same number of each type of cookie, and there are no cookies left over. What is the greatest number of boxes she can make?

5. The GCD of any two prime numbers is always 1.

6. Find the GCD of 28, 42, and 56.

GCD (28, 42, 56) =