Factors and Multiples

Find ALL FACTORS of 24

• 1, 2, 12, 24

• 1, 2, 8, 24

• 1, 2, 3, 4, 5, 6, 8, 12, 24

• 1, 2, 3, 4, 6, 8, 12, 24

Which are factors of 20?

• 1,2,4,5,10,20

• 3,5,7,9

• 40,80,100

• 15,25,35

List the factors of 30

• 1,2,3,5,6,10,15,30

• 2,4,6,8,10,12

• 3,10,5,7

• 8,7,5,8,6

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)

Which number is Prime?

• 12

• 15

• 4

• 3

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors

Which number is Composite?

• 3

• 5

• 11

• 12

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

• 7
• 14
• 22
• 28

Which of the following is a multiple of 7?

• 28
• 48
• 71
• 45

Which of the following are multiples of 4?

• 1, 2, 4
• 8, 12, 16, 20
• 2, 4, 6, 8, 12
• 1, 2, 3, 4,