Recognizing Divisibility and Its Applications

What must be true about the ones digit of a number for it to be divisible by 2?

• It must be even.

• It must be a prime number.

• It must be odd.

• It must be greater than 5.

How can you quickly determine if a number is divisible by 3?

• Multiply the digits and see if the product is divisible by 3.

• Add the digits and see if the sum is divisible by 3.

• Check if the number is even.

• Check if the number ends in 3.

What is the rule for determining if a number is divisible by 4?

• The last two digits must be divisible by 4.

• The number must be a multiple of 2.

• The number must end in 4.

• The number must be even.

Which of the following numbers is divisible by 5?

• 456

• 380

• 123

• 789

For a number to be divisible by 6, it must be divisible by which two numbers?

• 2 and 4

• 4 and 5

• 3 and 5

• 2 and 3

Why is 380 not divisible by 6?

• It is not divisible by 2.

• It is not divisible by 3.

• It is not divisible by 4.

• It is not divisible by 5.

What is the relationship between divisibility by 3 and divisibility by 9?

• If a number is divisible by 3, it is always divisible by 9.

• There is no relationship.

• A number divisible by 3 is never divisible by 9.

• If a number is divisible by 9, it is always divisible by 3.

What is the rule for determining if a number is divisible by 10?

• The number must be a multiple of 2.

• The number must end in 0.

• The number must be even.

• The number must end in 5.

Which of the following numbers is divisible by 10?

• 789

• 380

• 456

• 123

Which numbers is 380 divisible by?

• 2, 4, 5, 10

• 2, 3, 5, 9

• 2, 3, 4, 5

• 3, 4, 6, 10