LCM MCQs

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Question 1

What would be the smallest natural number which when divided either by 20 or by 42 or by 76 leaves a remainder ‘7’ in each case is_

  • 3047

  • 6047

  • 7987

  • 63847

Question 2

Three friends started running together on a circular track at 8:00:00 am. Time taken by them to complete one round of the track is 15 min, 20 min, 30 min respectively. If they run continuously without any halts, then at what time will they meet again at the starting point for the fourth time ?
  • 8:30:00 am
  • 9:00:00 pm
  • 12:00:00 pm
  • 12:00:00 am

Question 3

The LCM of two co-prime numbers is 117. What is the sum of squares of the numbers ?

  • 220

  • 520

  • 250

  • 200

Question 4

HCF of two numbers is 11 and their LCM is 385. If the numbers do not differ by more than 50, what is the sum of the two numbers ?

  • 132

  • 143

  • 121

  • 136

Question 5

Two numbers are in the ratio of 5:7. If their LCM is 105, what is the difference between their squares ?

  • 216

  • 210

  • 72

  • 840

Question 6

Which of the following is the largest of all ? (i) 7/8 (ii) 15/16 (iii) 23/24 (iv) 31/32

  • (i)

  • (ii)

  • (iii)

  • (iv)

Question 7

Two numbers are in the ratio 3 : 5. If their L.C.M. is 75. what is sum of the numbers?
  • 25
  • 45
  • 40
  • 50

Question 8

Ratio of two numbers is 3:2. If LCM of numbers is 60, then smaller number is?

  • 20

  • 30

  • 40

  • 50

Question 9

Three numbers are in the ratio of 2 : 3 : 4 and their H.C.F. is 20. Their L.C.M. is:

  • 80

  • 180

  • 240

  • 480

Question 10

What is the lowest common multiple of 12, 36 and 20?

  • 120

  • 180

  • 360

  • 240

There are 16 questions to complete.

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