HCF and LCM Practice Question and Answer

Q:

What is the highest common factor of 2x3 + x2 -x -2 and 3x3- 2x2 + x - 2 ? 

1334 0

  • 1
    x – 1
    Correct
    Wrong
  • 2
    x + 1
    Correct
    Wrong
  • 3
    2x + 1
    Correct
    Wrong
  • 4
    2x – 1
    Correct
    Wrong
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Answer : 1. " x – 1"

Q:

A six digit number is formatted by repeating a three digit number: for example, 256, 256 or 678, 678 etc. Any number of this form is always exactly divisible by:

1334 0

  • 1
    7 only
    Correct
    Wrong
  • 2
    11 only
    Correct
    Wrong
  • 3
    13 only
    Correct
    Wrong
  • 4
    1001 only
    Correct
    Wrong
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Answer : 4. "1001 only "

Q:

Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simultaneously at some time. They will again ring simultaneously after: 

1332 0

  • 1
    6 minutes
    Correct
    Wrong
  • 2
    12 minutes
    Correct
    Wrong
  • 3
    18 minutes
    Correct
    Wrong
  • 4
    24 minutes
    Correct
    Wrong
  • Show Answer
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Answer : 1. "6 minutes "

Q:

The H.C.F. of two numbers is 8. Which one of the following can never be their L.C.M? 

1329 0

  • 1
    24
    Correct
    Wrong
  • 2
    48
    Correct
    Wrong
  • 3
    56
    Correct
    Wrong
  • 4
    60
    Correct
    Wrong
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Answer : 4. "60"

Q:

The greatest number, which when subtracted from 5834, gives a number exactly divisible by each of 20, 28, 32 and 35, is 

1319 0

  • 1
    1120
    Correct
    Wrong
  • 2
    4714
    Correct
    Wrong
  • 3
    5200
    Correct
    Wrong
  • 4
    5600
    Correct
    Wrong
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Answer : 2. "4714 "

Q:

A, B and C start running around a circular field having circumference 144 metre at the same time from the same point. Speeds of A, B and C are 6 m/minute, 8 m/minute and 12 m/minute. Find after how much time, they will meet again at the same point for the first time.

1311 1

  • 1
    72 minutes
    Correct
    Wrong
  • 2
    36 minutes
    Correct
    Wrong
  • 3
    144 minutes
    Correct
    Wrong
  • 4
    18 minutes
    Correct
    Wrong
  • 5
    None of these
    Correct
    Wrong
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Answer : 1. "72 minutes"

Q:

The HCF and LCM of two numbers are 12 and 336 respectively. If one of the number is 84, the other is

1308 0

  • 1
    36
    Correct
    Wrong
  • 2
    48
    Correct
    Wrong
  • 3
    72
    Correct
    Wrong
  • 4
    96
    Correct
    Wrong
  • Show Answer
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Answer : 2. "48"

Q:

The least number which when divided by 4, 6, 8, 12 and 16 leaves a remainder of 2 in each case is: 

1290 0

  • 1
    46
    Correct
    Wrong
  • 2
    48
    Correct
    Wrong
  • 3
    50
    Correct
    Wrong
  • 4
    56
    Correct
    Wrong
  • Show Answer
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Answer : 3. "50 "

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