Topic 5 Test

What is the greatest common factor of 18 and 54?

• 9
• 6
• 2
• 3

Which is the prime factorization of 75?

• 3 x 25
• 5 x 3 x 3
• 3 x 5 x 5
• 3 x 3 x 5 x 5

Which of the following numbers is prime? 

• 9
• 15
• 21
• 23

At the beginning of the school year, Soe Gay's class had 4 new students out of 20 enrolled. What is 4/20 written in simplest form? 

• 4/5
• 2/10
• 1/5
• 1/4

What is the GCF of 45 and 60?

• 5
• 10
• 15
• 20

Three-twelfths of the girls on Paw Su's soccer team missed practice. Which of the following is equal to 3/12?

• 1/10
• 1/4
• 9/24
• 5/14

Which step can be used to write 10/15 in simplest form? 

• Divide 10 and 15 by their GCF, 5
• Divide 10 and 15 by their GCF, 10
• Multiply 10 and 15 by their GCF, 5
• Multiply 10 and 15 by their GCF, 10

Which is a prime number?

• 33
• 35
• 37
• 39

Is 1 prime or composite? 

• Prime
• Composite

Find the greatest common factor for 20, 32, 44

• 2
• 8
• 5
• 4