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Prime Numbers and Prime Factorization

Practice identifying prime numbers, composite numbers, and expressing numbers as products of prime factors

21 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

<span style="color:" rgb(51,="" 51,="" 51);="" font-family:="" arial,="" helvetica,="" sans-serif;="" font-size:="" 13px;="" background-color:="" rgb(255,="" 251,="" 251);="">How can 54 be represented as the product of prime numbers?

  1. 3 × 2 × 8
  2. 2 × 2 × 11
  3. 3 × 2 × 3 × 3
  4. 3 × 2 × 9
Question 2 Multiple Choice (Single Answer)

Which of the following numbers is not a prime number?

  1. 109
  2. 119
  3. 139
  4. 149
Question 3 Multiple Choice (Single Answer)

Which of the following numbers is composite?

  1. 129
  2. 107
  3. 97
  4. 96
Question 4 Multiple Choice (Single Answer)

Which of the following numbers is prime?

  1. 78
  2. 89
  3. 94
  4. 102
Question 5 Multiple Choice (Single Answer)

Which of the following sets of numbers are the prime numbers less than 10?

  1. 2, 4, 6, 8
  2. 1, 3, 5, 7, 9
  3. 2, 3, 5, 7
  4. 1, 2, 3, 5, 7
Question 6 Multiple Choice (Single Answer)

Every _____ number can be written as the product of prime numbers.

  1. whole
  2. prime
  3. composite
  4. both 1 and 3
Question 7 Multiple Choice (Single Answer)

Which of the following sets of numbers are the prime numbers greater than 30 and less than 40?

  1. 31, 33, 35, 37, 39
  2. 31, 37
  3. 31, 33, 37
  4. 31, 33, 37, 39
Question 8 Multiple Choice (Single Answer)

The numbers _____ and _______ are neither prime nor composite.

  1. 0 and 0
  2. 0 and 1
  3. 1 and 2
  4. 1 and 3
Question 9 Multiple Choice (Single Answer)

Which of the following numbers is not composite?

  1. 12
  2. 17
  3. 22
  4. 26
Question 10 Multiple Choice (Single Answer)

<span style="font-family:" arial;="" font-size:="" small;="">How can 242 be represented as the product of prime numbers?

  1. 11 × 11
  2. 2 × 2 × 11
  3. 2 × 11
  4. 2 × 11 × 11
Question 11 Multiple Choice (Single Answer)

Which of the following numbers is the greatest prime number less than 100?

  1. 99
  2. 98
  3. 97
  4. 95
Question 12 Multiple Choice (Single Answer)

<span style="font-family:" arial;="" font-size:="" small;="">How can 74 be represented as the product of prime numbers?

  1. 2 × 37
  2. 23 × 37
  3. 22 × 37
  4. 24 × 37
Question 13 Multiple Choice (Single Answer)

<span style="font-family:" arial;="" font-size:="" small;="">How can 343 be represented as the product of prime numbers?

  1. 78
  2. 76
  3. 75
  4. 73
Question 14 Multiple Choice (Single Answer)

Which of the following sets of numbers are the prime numbers greater than 20 and less than 30?

  1. 23, 37, 29
  2. 23 and 27
  3. 23 and 29
  4. 17 and 19
Question 15 Multiple Choice (Single Answer)

Which of the following options is same as 56?

  1. 71 × 22
  2. 73 × 21
  3. 71 × 23
  4. 72 × 21
Question 16 Multiple Choice (Single Answer)

<span style="color:" rgb(51,="" 51,="" 51);="" font-family:="" arial,="" helvetica,="" sans-serif;="" font-size:="" 13px;="" background-color:="" rgb(255,="" 251,="" 251);="">How can 220 be represented as the product of prime numbers?

  1. 22 × 5 × 11
  2. 22 × 3 × 11
  3. 2 × 5 × 11
  4. 23 × 5 × 11
Question 17 Multiple Choice (Single Answer)

Which of the following sets of numbers represents the prime numbers between 6 and 21?

  1. 7, 9, 11, 13, 17, 19
  2. 7, 8, 10, 12, 14, 16, 18
  3. 7, 11, 13, 17
  4. 7, 11, 13, 17, 19
Question 18 Multiple Choice (Single Answer)

<span style="font-family:" arial;="" font-size:="" small;="">Which of the following options is same as 786?

  1. 27 × 31
  2. 28 × 31
  3. 22 × 53
  4. 23 × 31 × 54
Question 19 Multiple Choice (Single Answer)

<span style="color:" rgb(51,="" 51,="" 51);="" font-family:="" arial,="" helvetica,="" sans-serif;="" font-size:="" 13px;="" background-color:="" rgb(255,="" 251,="" 251);="">How can 196 be represented as the product of prime numbers?

  1. 2 × 73
  2. 24 × 7
  3. 23 × 72
  4. 22 × 72
Question 20 Multiple Choice (Single Answer)

<span style="font-family:" arial;="" font-size:="" small;="">Which of the following options is same as 88?

  1. 111 × 22
  2. 112 × 32
  3. 111 × 23
  4. 112 × 22
Question 21 Multiple Choice (Single Answer)

How can 144 be represented as the product of prime numbers?

  1. 23 × 32
  2. 22 × 51
  3. 24 × 32
  4. 23 × 32 × 52
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