Back to the lesson and practice
ActivityPractice worksheetRiddle puzzleFlashcards
Do it🖨️ On paper✏️ On screen
New copyMake a new one

Works with a finger, a stylus or a mouse. Nothing is saved or sent anywhere.

Write your answers with a finger, mouse or stylus. Switch to Scroll to move around the page. A stylus always writes.

eurekami

Prime factorisation

6th grade (Year 7 in England) · 16 questions · Common Core: 6.NS.B.4 · England: KS3 Number, GCSE Foundation Number, 11+ Number

Name

Date

Score/ 16

  1. Question 1

    66 is written as a product of primes. What is the largest prime factor?

    Answer

  2. Question 2

    Which is 150 written as a product of prime factors?

    • A. 2 × 3² × 5
    • B. 2 × 3 × 5²
    • C. 3 × 5²
    • D. 2² × 3 × 5²

  3. Question 3

    98 is written as a product of primes. What is the largest prime factor?

    Answer

  4. Question 4

    Which is 72 written as a product of prime factors?

    • A. 2³ × 3²
    • B. 2² × 3²
    • C. 2⁴ × 3²
    • D. 2³ × 3 × 5

  5. Question 5

    78 is written as a product of primes. What is the largest prime factor?

    Answer

  6. Question 6

    Which is 48 written as a product of prime factors?

    • A. 2⁴ × 5
    • B. 2³ × 3
    • C. 2⁵ × 3
    • D. 2⁴ × 3

  7. Question 7

    66 is written as a product of primes. What is the largest prime factor?

    Answer

  8. Question 8

    Which is 126 written as a product of prime factors?

    • A. 2 × 3³
    • B. 2² × 3² × 7
    • C. 2 × 3² × 7
    • D. 3² × 7

  9. Question 9

    20 is written as a product of primes. What is the largest prime factor?

    Answer

  10. Question 10

    Which is 24 written as a product of prime factors?

    • A. 2⁴ × 3
    • B. 2³ × 3
    • C. 2³ × 5
    • D. 2² × 3

  11. Question 11

    42 is written as a product of primes. What is the largest prime factor?

    Answer

  12. Question 12

    Which is 108 written as a product of prime factors?

    • A. 2² × 3³
    • B. 2³ × 3³
    • C. 2 × 3³
    • D. 2² × 3² × 5

  13. Question 13

    75 is written as a product of primes. What is the largest prime factor?

    Answer

  14. Question 14

    Which is 72 written as a product of prime factors?

    • A. 2⁴ × 3²
    • B. 2² × 3²
    • C. 2³ × 3 × 5
    • D. 2³ × 3²

  15. Question 15

    70 is written as a product of primes. What is the largest prime factor?

    Answer

  16. Question 16

    Which is 360 written as a product of prime factors?

    • A. 2² × 3² × 5
    • B. 2⁴ × 3² × 5
    • C. 2³ × 3³
    • D. 2³ × 3² × 5

Write your answers right on the page. · Free from eurekami.com

All done? Check your answers
  1. 11
  2. 2 × 3 × 5²
  3. 7
  4. 2³ × 3²
  5. 13
  6. 2⁴ × 3
  7. 11
  8. 2 × 3² × 7
  9. 5
  10. 2³ × 3
  11. 7
  12. 2² × 3³
  13. 5
  14. 2³ × 3²
  15. 7
  16. 2³ × 3² × 5