Lesson Worksheet: Prime and Composite Numbers Mathematics

In this worksheet, we will practice deciding whether a number is prime or composite using models and finding the prime factors of a number.

Q1:

Which of the following is the prime factorization of 11?

  • A2×9
  • B1
  • C11×1
  • D11×11
  • E11

Q2:

What is the largest prime factor of 120?

Q3:

The prime factorization of a number is 2×2×3×3. What is the number?

Q4:

Find the prime factoring of 16.

Hint: Draw a factor tree to help you.

  • A2×8
  • B2×2×4
  • C2×2×2×2×2
  • D2×2×2×2
  • E1×16

Q5:

Find the prime number where the sum of the factors is 84.

Q6:

Is 23 a prime or a composite number?

  • Aa composite number
  • Ba prime number

Q7:

Find the smallest number whose prime factors are 3, 5, and 7.

Q8:

Which of the following is not a prime number?

  • A23
  • B73
  • C68
  • D2

Q9:

Yara has found that 7×13=91.

Is 91 a prime or a composite number?

  • Aa composite number
  • Ba prime number

Q10:

Find the missing number in the given Venn diagram.

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