Divisibility/Prime Factorization

What is the divisibility rule for 3?

• Add up the digits. The sum must be even and divisible by 3.
• The digits must add up to 9.
• The last digit must be a 3.
• Add up the digits. The sum must be divisible by 3.

Tags

CCSS.4.OA.B.4

You have two numbers, 20 and 100. What number can you divide out of both of them?

• 3
• 10
• 9
• 15

Tags

CCSS.4.NBT.B.6

What is the divisibility rule for 5?

• The digits must add up to 10.
• The last digit needs to be a 5 or 0.
• The last digit can only be a 5.
• The sum of the digits need to be divisible by 5.

Tags

CCSS.5.OA.B.3

Is 81 divisible by 3?

• Yes, because the sum of the digits is 9, a multiple of 3

• No, because 81 is an odd number

• Yes, because 81 is an odd number

• No, because 81 does not end in 3

Tags

CCSS.4.OA.B.4

70 can be evenly divided by which number?

• 5
• 10
• 2
• All of the above

Tags

CCSS.4.OA.B.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

Tags

CCSS.4.NBT.A.1

All of these numbers are divisible by 5 except for...

• 75,395
• 984,940
• 222,222,235
• 8,943,892

Tags

CCSS.4.OA.B.4

Name the factors of 16.

• 1, 4, 16
• 4
• 1, 2, 4, 8, 16
• 2, 4, 8

Tags

CCSS.4.OA.B.4

Name the factors of 21.

• 1, 3, 7, 21
• 3, 7
• 1, 21
• 1, 2, 7, 21

Tags

CCSS.4.OA.B.4

Name the factors of 27.

• 1, 3, 9, 27
• 3, 9
• 1, 27
• 1, 2, 3, 27

Tags

CCSS.4.OA.B.4