Prime factors and perfect squares

Answer Key - Grade 6 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari follows a map clue. Which of these numbers is prime?

   • 9
   • 7
   • 1
   • 8
2. 2.

   Jun finds a riddle in a book. Which number has just two factors, itself and one?

   • 27
   • 16
   • 1
   • 17
3. 3.

   Pia picks a card. Which one shows 45 as a product of primes?

   • 3 × 5
   • 1 × 3 × 3 × 5
   • 5 × 9
   • 3 × 3 × 5
4. 4.

   Ren picks a card. Which one shows 50 as a product of primes?

   • 1 × 2 × 5 × 5
   • 2 × 5
   • 2 × 5 × 5
   • 2 × 25
5. 5.

   Tala picks a card. Which one shows 30 as a product of primes?

   • 1 × 2 × 3 × 5
   • 5 × 6
   • 2 × 3 × 5
6. 6.

   Bo draws a factor tree for 70. It splits first into 5 and 14. Then 14 splits into 2 and 7. What is the missing prime?

7. 7.

   Kira starts a factor tree for 48 with 48 = 6 × 8. After finishing the tree, what is 48 as a product of primes?

   2, 2, 2, 2, 3
8. 8.

   Luz starts a factor tree for 32 with 32 = 4 × 8. After finishing the tree, what is 32 as a product of primes?

   2, 2, 2, 2, 2
9. 9.

   Milo reads 3² in a puzzle. What is 3²?

   9
10. 10.

    Pia reads 5² in a puzzle. What is 5²?

    25