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?

   • 53
   • 52
   • 51
   • 1
2. 2.

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

   • 91
   • 1
   • 80
   • 79
3. 3.

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

   • 88
   • 1
   • 87
   • 89
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.

   Jun writes 72 as a product of primes. How many primes are multiplied together? Count a prime again each time it repeats.

   5
6. 6.

   Kira writes 200 as a product of primes. How many primes are multiplied together? Count a prime again each time it repeats.

   5
7. 7.

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

   5
8. 8.

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

   4
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.

    Tala is playing a number game. What is the smallest whole number greater than 0 you can multiply 52 by to get a perfect square?

    13