Numbers Sense

Which lists all the factors of 15?

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

Which set lists all the factors of 24?

• 1, 2, 3, 6, 7, 12, 24
• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 2, 3, 4, 5, 6, 8, 12, 24
• 1, 3, 4, 6, 8, 24

Which lists all the factors of 40?

• 1, 2, 4, 5, 8, 12, 14, 40
• 1, 2, 3, 4, 5, 8, 10, 40
• 1, 2, 4, 5, 8, 10, 20, 40
• 1, 2, 5, 8, 20, 40

All even numbers have which number as a factor?

• 3
• 4
• 2
• 5

List the first 5 multiples of 3

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

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)

List the first 5 multiples of 8

• 1, 2, 4, 8
• 8, 16, 25, 32, 40
• 8, 16, 24, 32, 40
• 8, 16, 24, 31, 40

What is the next multiple?
12, 24, 36, 48, _____

• 1
• 72
• 60
• 84

What is the least common multiple (LCM) of 5 and 20?

• 4
• 5
• 20
• 100

What is the least common multiple (LCM) of 4 and 10?

• 4
• 40
• 15
• 20