Find all the factors

Check all the correct answers.

Which of the following numbers have 2 as a factor?

• 8

• 10

• 15

• 24

Check all the correct answers.

Which of the following numbers have 5 as a factor?

• 15

• 20

• 25

• 32

Is 3 a factor of 21?

• yes

• no

Is 3 a factor of 26?

• yes

• no

Is 5 a common factor of 75 and 80?

• yes

• no

Is 8 a common factor of 72 and 96?

• yes

• no

Which lists all the factors of 64?

• 1, 64

• 1, 2, 3, 4, 5, 6, 7, 8

• 1, 2, 32, 64

• 1, 2, 4, 8, 16, 32, 64

Which lists all the factors of 100?

• 1, 2, 4, 5, 10, 20, 25, 50, 100

• 1, 100

• 1, 2, 3, 4, 5, 6, 7, 8, 25, 50, 100

• 1, 2, 4, 5, 10

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