HCF and LCM Practice Question and Answer

Q:

The least multiple of 13, which on dividing by 4, 5, 6, 7 and 8 leaves remainder 2 in each case is 

1176 0

  • 1
    2522
    Correct
    Wrong
  • 2
    840
    Correct
    Wrong
  • 3
    2520
    Correct
    Wrong
  • 4
    842
    Correct
    Wrong
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Answer : 1. "2522 "

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

1175 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

1144 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:

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

1143 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:

A number which when divided by 10 leaves remainder of 9, when divided by 9 leaves a remainder of 8, and when divided by 8 leaves a remainder of 7, is: 

1130 0

  • 1
    359
    Correct
    Wrong
  • 2
    1359
    Correct
    Wrong
  • 3
    1539
    Correct
    Wrong
  • 4
    539
    Correct
    Wrong
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Answer : 1. "359 "

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-

1127 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 ratio of two numbers is 2: 3 and their L.C.M is 48.  What is the number?

1113 0

  • 1
    8, 6
    Correct
    Wrong
  • 2
    16, 24
    Correct
    Wrong
  • 3
    18, 32
    Correct
    Wrong
  • 4
    25, 28
    Correct
    Wrong
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Answer : 2. "16, 24"

Q:

The LCM of two positive integers is twice the larger number and the HCF of the two numbers is 3. The smaller number is:

1108 0

  • 1
    6
    Correct
    Wrong
  • 2
    10
    Correct
    Wrong
  • 3
    9
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 1. "6 "

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