HCF AND LCM

Find the HCF of 21 and 28

• 3

• 4

• 7

• 14

What is the LCM of 4 and 12? 

• 4
• 8
• 12
• 16

Find the HCF of 12 and 15 ?

• 2
• 2 x 3
• 3
• 60

Find the HCF of 40 and 60?

• 10
• 20
• 30
• None of the above

Find the HCF of 30 and 36

• 2
• 3
• 4
• 6

Find the LCM of 12 and 16...

• 48

• 36

• 64

• 96

A carpenter got given some free wooden planks. Some are 12m long and some are 18m long. She wants to cut them up so that she has equal size planks to make using them easier. What size planks should she cut them into to avoid wasting any wood?

• HCF

• LCM

The least common multiple of 12, 30, and 40 is…

• 40

• 60

• 120

• 160

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

• 14

• 7

• 4

• 2

Find the HCF for 18, 36, and 81

• 3

• 2

• 6

• 9