LCM & HCF

Find the HCF of 30 and 25

• 5

• 6

• 10

• 15

Find the LCM of 6 and 9...

• 18

• 30

• 24

• 36

Derek advises a patient to have a scale every 4 months and a polish every 6 months. If they have a scale and polish today, how long will they wait before they can have both during the same appointment?

• HCF

• LCM

Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?

• HCF

• LCM

Find the HCF for 18, 36, and 81

• 3

• 2

• 6

• 9

The highest common factor of 28, 42, and 76 is….

• 14

• 7

• 4

• 2

The product of two numbers is 4107 . if the H C F of these numbers is 37, then the greater number is :

• 101

• 107

• 111

• 185

Answer explanation

Answer : 111

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

• 4

• 10

• 15

• 16

Answer explanation

Answer : 16

The H C F of two numbers is 11 and their L C M is 7700. if one of the numbers is 275, then the other is :

• 279

• 283

• 308

• 318

Answer explanation

Answer : 308

Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.

• 4

• 7

• 9

• 13

Answer explanation

Answer : 4