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Quiz: HCF and LCM

5 questionsNo time limitPass: 60%+10 XP on first pass

HCF is the biggest common divisor, LCM the smallest common multiple. Learn the prime-factor method, the product rule and how to spot HCF vs LCM in word problems.

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  1. Question 1

    What is the HCF of 36 and 84?

  2. Question 2

    What is the LCM of 8, 12 and 20?

  3. Question 3

    The product of two numbers is 1500 and their HCF is 10. What is their LCM?

  4. Question 4

    Three traffic lights change every 30, 45 and 60 seconds. They changed together at 8:00:00. When will they next change together?

  5. Question 5

    What is the largest tile size (square, in cm) that can exactly cover a floor of 360 cm × 240 cm without cutting tiles?