Railways NTPC · Mathematics

HCF and LCM

20 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 20 questions

  1. What is the HCF of and ?
  2. What is the LCM of and ?
  3. What is the HCF of and ?
  4. What is the LCM of and ?
  5. What is the HCF of and ?
  6. What is the LCM of and ?
  7. What is the HCF of and ?
  8. What is the LCM of and ?
  9. What is the HCF of and ?
  10. What is the LCM of and ?
  11. What is the HCF of and ?
  12. What is the LCM of and ?
  13. What is the HCF of and ?
  14. What is the LCM of and ?
  15. What is the HCF of and ?
  16. What is the LCM of and ?
  17. What is the smallest number which when divided by 12, 15, 20, and 54 leaves a remainder of 8 in each case?
  18. The HCF and LCM of two numbers are 18 and 378 respectively. If one of the numbers is 54, what is the other number?
  19. Four electronic bells toll together at intervals of 6, 8, 12, and 18 seconds respectively. In 60 minutes, how many times will they toll together including the start?
  20. Find the greatest number of four digits which is exactly divisible by 15, 24, and 36.

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