Factors and Multiples, Prime and Composite

Which set of numbers show all the factors for 15?

• 7, 8
• 1, 15
• 1, 3, 5, 15
• 3, 5, 15

The only factors of 9 are 1 and 9 making the number 9 prime.

• True
• False

All even numbers have which number as a factor?

• 3
• 4
• 2
• 5

Which lists all the factors of 20?

• 1, 2, 4, 5, 10, 20
• 1, 2, 5, 10, 20
• 1, 4, 5, 20
• 1, 2, 10, 20

List the first 5 multiples of 3

• 3, 6 10, 15, 20
• 1, 3
• 3, 6, 9, 12, 15
• 6, 9, 12, 15, 18

Fill in the blank:
2, 4, 6, 8, 10, 12, ____, 16, 18 ,20

• 13
• 14
• 15
• 17

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 missing multiple.
10:  10, 20, 30, 40, ___, 60, 70, 80

• 100
• 45
• 50
• 55

When we skip count, we are listing .....

• factors
• multiplication 
• addition 
• multiples