HCF and LCM Practice Question and Answer

Q:

Three Alarm make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

838 0

  • 1
    10:07:36 hrs
    Correct
    Wrong
  • 2
    10:07:24 hrs
    Correct
    Wrong
  • 3
    10:07:12 hrs
    Correct
    Wrong
  • 4
    10:07:48 hrs
    Correct
    Wrong
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Answer : 3. "10:07:12 hrs"

Q:

a and b are two whole numbers and c is their HCF, then the LCM of those two numbers is

828 0

  • 1
    ab/c
    Correct
    Wrong
  • 2
    abc
    Correct
    Wrong
  • 3
    bc
    Correct
    Wrong
  • 4
    ac/b
    Correct
    Wrong
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Answer : 1. "ab/c"

Q:

The product of two number is 4107. If the HCF of the number is 37. The greatest number is

826 0

  • 1
    185
    Correct
    Wrong
  • 2
    111
    Correct
    Wrong
  • 3
    107
    Correct
    Wrong
  • 4
    101
    Correct
    Wrong
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Answer : 2. "111 "

Q:

If the product of three consecutive numbers is 210 then sum of the smaller number is: 

822 0

  • 1
    5
    Correct
    Wrong
  • 2
    11
    Correct
    Wrong
  • 3
    3
    Correct
    Wrong
  • 4
    4
    Correct
    Wrong
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Answer : 2. "11"

Q:

Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.

821 0

  • 1
    21
    Correct
    Wrong
  • 2
    42
    Correct
    Wrong
  • 3
    63
    Correct
    Wrong
  • 4
    36
    Correct
    Wrong
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Answer : 1. "21"

Q:

The product of two numbers is 2028 and their HCF is 13. The number of such pair is-

821 0

  • 1
    1
    Correct
    Wrong
  • 2
    2
    Correct
    Wrong
  • 3
    3
    Correct
    Wrong
  • 4
    4
    Correct
    Wrong
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Answer : 2. "2"

Q:

The HCF and LCM of two numbers are 21 and 4641 respectively. If one of the numbers lies between 200 and 300, then the two numbers are-

819 0

  • 1
    273, 357
    Correct
    Wrong
  • 2
    273,361
    Correct
    Wrong
  • 3
    273, 359
    Correct
    Wrong
  • 4
    273, 363
    Correct
    Wrong
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Answer : 1. "273, 357"

Q:

The least multiple of 7, which leaves the remainder 4, when divided by any of 6, 9, 15 and 18, is 

818 0

  • 1
    184
    Correct
    Wrong
  • 2
    364
    Correct
    Wrong
  • 3
    76
    Correct
    Wrong
  • 4
    94
    Correct
    Wrong
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Answer : 2. "364"

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