Primary 4 · Mathematics · Factors & Multiples
Factors & Multiples questions for Primary 4 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.
- Counting factors
- Recognising factors
- Common factors
- Common multiples
- Recognising multiples
- Odd one out
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.
How many factors does 24 have?
Answer: 8
The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24 — 8 of them.
Which of these numbers is a factor of 45?
Answer: 9
45 ÷ 9 = 5 exactly, so 9 is a factor of 45.
What is the largest number that is a factor of both 18 and 24?
Answer: 6
The common factors of 18 and 24 are 1, 2, 3 and 6, so the largest is 6.
What is the smallest number that is a multiple of both 4 and 6?
Answer: 12
Multiples of 4: 4, 8, 12… Multiples of 6: 6, 12… The first they share is 12.
Which of these numbers is a multiple of 8?
Answer: 72
8 × 9 = 72.
Which of these is NOT a factor of 60?
Answer: 8
60 ÷ 8 = 7 remainder 4, so 8 does not divide 60 exactly.
Two buses leave a stop together. One returns every 15 minutes and the other every 20 minutes. After how many minutes will they next leave together?
Answer: 60
Multiples of 15: 15, 30, 45, 60. Multiples of 20: 20, 40, 60. The first they share is 60 minutes.
Which number has exactly two factors?
Answer: 13
13 can only be divided by 1 and 13, so it has exactly two factors.
36 sweets and 48 biscuits are packed into identical bags with nothing left over. What is the greatest number of bags possible?
Answer: 12
The bags must divide both 36 and 48. Their common factors are 1, 2, 3, 4, 6 and 12, so 12 bags is the greatest.
Which of these numbers is a multiple of both 3 and 4?
Answer: 36
36 = 3 × 12 and 36 = 4 × 9, so it is a multiple of both.