Divisibility Rules

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.

Is 1,284,604 divisible by 2?

• Yes, because the sum of the digits is 20, which is an even number

• No, because 4 is an odd number

• Yes, because 4 is an even number

• No, because the it is not divisible by 3

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.

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

What is the divisibility rule for 1

• It has to be an even number

• Every number is divisible by 1

• Add up all of the digits and if it is divisible by 1 then the whole number is.

2360 is divisible by

• 2

• 3

• 5

• 10

A number is divisible by 2 if ...

• it is even and ends in 0,2,4,6 or 8

• it is uneven

Insert the correct digit to make the following number divisible by 3.
60__2

• 1
• 2
• 3
• 5

Is 60,714 divisible by 3?

• Yes
• No

Is 333,353 divisible by 3?

• Yes
• No