Prime factors and perfect squares

Answer Key - Grade 6 Math Worksheet - Challenge Me

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

1. 1.

   Pia checks a hint on a map. Which one of these numbers is prime?

   • 1
   • 52
   • 53
   • 51
2. 2.

   Ren is solving a riddle. Which one of these numbers is a prime number?

   • 80
   • 1
   • 79
   • 91
3. 3.

   Tala reads a clue in a book. Which of these is the prime number?

   • 89
   • 88
   • 1
   • 87
4. 4.

   Zee breaks 84 into primes. You can type 5 × 5 × 7 or 5^2 × 7. What should Zee write?

   2, 2, 3, 7
5. 5.

   Ari wants 96 as a product of primes. You can type 5 × 5 × 7 or 5^2 × 7. What should Ari write?

   2, 2, 2, 2, 2, 3
6. 6.

   Luz writes 108 as a product of primes. How many primes are multiplied together? Count a prime again each time it repeats.

   5
7. 7.

   Milo writes 150 as a product of primes. How many primes are multiplied together? Count a prime again each time it repeats.

   4
8. 8.

   Pia is playing a number game. What is the smallest whole number greater than 0 you can multiply 56 by to get a perfect square?

   14
9. 9.

   Ren is playing a number game. What is the smallest whole number greater than 0 you can multiply 99 by to get a perfect square?

   11
10. 10.

    Ari paints on a square canvas with an area of 256 square inches. How long is each side, in inches?

    16