Divisibility Rules

Any number which ends in a 2, 4, 6, 8, or 0 is even, and therefore divisible by which number?

• 2

• 4

• 6

• 8

What is the divisibility rule for 3?

• Add up the digits. The sum must be an even number

• The digits must add up to 9.

• The last digit must be a 3.

• Add up the digits. The sum of the digits must be divisible by 3.

What is the divisibility rule for 4?

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

• The last two digits must be divisible by 4

• The number must be divisible by 2 and 3.

• The number must end in 0, 2, or 4

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.

2520 is divisible by 6 because:

• It is divisible by 2 (even) and 5 (ends in a 0 or 5)

• The sum of the digits is 12, a multiple of 6

• It's divisible by 2 (even) and 3 (sum of digits is a multiple of 3)

• The sum of the digits is even

How do you know if a number is divisible by 8?

• If the sum of the numbers add up to 8

• If the last 3 digits form a number that is divisible by 8

• if the lat digit is an 8

• If the number is an even number

Any whole number is divisible by 9 if the sum of the digits...

• is divisible by 9

• is divisible by 4

• ends in 0 or 5

• ends in 3, 6, or 9

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

If a number is divisible by two and three, then it is also divisible by which number?

• 6

• 4

• 2

• 3

What are all prime numbers divisable by?

• 1, 2, and itself
• 1 and itself
• Every number from 1-10
• They aren't divisable at all