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Primary 6 · Mathematics · Factors & Multiples

Factors & Multiples questions for Primary 6 Maths

10 questions to work through online. Answer and you get the working straight away, then a score at the end. No sign-up, and you can retake it as often as you like.

  • Highest common factor
  • Lowest common multiple
  • Prime numbers
  • Listing factors
  • Common multiple in context
  • Square numbers
  • Highest common factor in context
  • Multiples
  • Prime factors
  • Lowest common multiple in context
0 of 10 answered
Question 1 of 10Highest common factor
What is the highest common factor of 48 and 72?
Question 2 of 10Lowest common multiple
What is the lowest common multiple of 9 and 12?
Question 3 of 10Prime numbers
Which of these numbers is prime?
Question 4 of 10Listing factors
How many factors does 36 have?
Question 5 of 10Common multiple in context
Two bells ring every 8 minutes and every 12 minutes. They ring together at 09 00. When do they next ring together?
Question 6 of 10Square numbers
Which of these is a square number?
Question 7 of 10Highest common factor in context
A 48 cm ribbon and a 60 cm ribbon are cut into pieces of equal length, as long as possible. How long is each piece?
Question 8 of 10Multiples
Which of these numbers is a multiple of both 6 and 8?
Question 9 of 10Prime factors
Which of these is a product of two different prime numbers?
Question 10 of 10Lowest common multiple in context
Siti has a 6-step stride and Ravi has an 8-step stride. They start together. After how many steps of the path will they next land on the same mark?
Answers and explanations for all 10 questions

Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.

  1. What is the highest common factor of 48 and 72?

    Answer: 24

    48 = 24 × 2 and 72 = 24 × 3, and nothing larger than 24 divides both.

  2. What is the lowest common multiple of 9 and 12?

    Answer: 36

    Multiples of 9: 9, 18, 27, 36. Multiples of 12: 12, 24, 36. The first they share is 36.

  3. Which of these numbers is prime?

    Answer: 29

    29 has no factors other than 1 and 29, so it is prime.

  4. How many factors does 36 have?

    Answer: 9

    The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18 and 36 — nine of them.

  5. Two bells ring every 8 minutes and every 12 minutes. They ring together at 09 00. When do they next ring together?

    Answer: 09 24

    The first common multiple of 8 and 12 is 24, so they next ring together at 09 24.

  6. Which of these is a square number?

    Answer: 64

    8 × 8 = 64, so 64 is a square number.

  7. A 48 cm ribbon and a 60 cm ribbon are cut into pieces of equal length, as long as possible. How long is each piece?

    Answer: 12 cm

    The longest length that divides both 48 and 60 is their HCF, 12 cm.

  8. Which of these numbers is a multiple of both 6 and 8?

    Answer: 48

    48 = 6 × 8, so it is a multiple of both.

  9. Which of these is a product of two different prime numbers?

    Answer: 15

    15 = 3 × 5, and 3 and 5 are different primes.

  10. Siti has a 6-step stride and Ravi has an 8-step stride. They start together. After how many steps of the path will they next land on the same mark?

    Answer: 24

    The first common multiple of 6 and 8 is 24.