4 grade hcf and lcm

What are the factors of 25?

• 1,2,5,10

• 1,2,5,25

• 1,5,25

• 3,5,15,25

What is the HCF of 18 and 12?

• 6

• 2

• 12

• 3

What is the HCF of 12 and 30?

• 6

• 2

• 12

• 3

Click to the multiple of 12.

• 25

• 48

• 35

• I94

A prime number is...

• a number that has only one factor.
• a number that has at least two factors.
• a number that has more than two factors.
• a number that has only two factors.
  (1 and itself)

Joe has listed the first 4 multiples of 7 as: 
7   14    22     28
Which one is incorrect?

• 7
• 14
• 22
• 28

Find the LCM of 12 and 16...

• 48

• 36

• 64

• 96

Find the LCM of 6 and 9...

• 18

• 30

• 24

• 36

Which of these numbers is not prime?

• 17

• 25

• 23

• 37