Rules of divisibility

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

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.

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

Tags

CCSS.4.NBT.B.6

CCSS.4.OA.B.4

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

Tags

CCSS.4.OA.B.4

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

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

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 is divisible by 8

• if the lat digit is an 8

• If the number is an even number

An integer is divisible by 9 if...

• the number ends in 9

• the number ends in an odd number

• the number is an even number

• if the sum of the digits is divisible by 9

What is the divisibility rule for 6?

• It is divisible by 2 and 3

• It is divisible by 3 and 4

• It is divisible by 2 and 4

• The last digit is zero