Factors, Divisibility Rules and Multiples

A number that has more than 2 factors is called a __________ number.

• prime
• composite
• odd
• even

A number that has only two factors, 1 and itself, is called a _______ number.

• prime
• composite
• odd
• even

Four students each made a list of prime numbers.

Eric: 5, 7 17, 23

Maya: 3, 5, 13, 17

Bella: 3,9, 17, 19

Joan: 7, 11, 13, 23

Who made an error and included a composite number?

• Eric

• Maya

• Bella

• Joan

Which from the following is divisible by 3 ?

• 154

• 155

• 636

• 112

What is the divisibility rule for 4?

• The sum of the digits must be a multiple of 4

• The last two digits must form a number that is a multiple of 4

• The number must be divisible by 2 and 3.

• The number must end in 0, 2, or 4

A number is divisible by 10 if

• It is even

• It ends in 0

• It ends in 0 or 5

• The sum of the digits is a multiple of 10

A number is divisible by 3 if...

• it ends in 33
• the last two digits can be divided by 3
• you add up all of the digits and the sum can be divided by 3 
• it's even

Is 64 divisible by 2?

• Yes
• No

70 can be evenly divided by which number?

• 5
• 10
• 2
• All of the above

Which of these is divisible by 6?

• 318
• 215
• 7000
• 4765