Divisibility Rules

A number is divisible by 2 if...

• it ends in 2, 4, 6, 8, or 0

• it ends in 2, 4, 6, 8, or 10

• it ends in 5 or 0

• it ends in 2

A number is divisible by 3 if...

• it ends in a 3

• it ends in a 3, 6, or 9

• you add up the digits and that number is divisible by 3

• you add up the digits and that number is divisible by 2

A number is divisible by 4 if...

• the last digit is a 4

• the last digit is a 4 or 8

• the last two digits are divisible by 4

• the sum of its digits is a number divisible by 4

A number is divisible by 5 if...

• the last digit is a 0 or 5

• the last digit is a 5

• you add up the digits and that number is divisible by 5

• the last digit is a 0

Tags

CCSS.4.OA.B.4

A number is divisible by 6 if...

• it is divisible by both 2 and 3

• if the last digit is a 6

• if you add up the digits and that number is divisible by 6

• if the last two digits are divisible by 6

A number is divisible by 8 if...

• the last two digits are divisible by 8

• the last three digits are divisible by 8

• the last digit is 8

• you add up the digits and that number is divisible by 8

A number is divisible by 9 if...

• the last digit is a 3, 6, or 9

• the last digit is a 9

• you add up the digits and that number is divisible by 9

• the last two digits is divisible by 9

A number is divisible by 10 if...

• the last digit is a 0 or 5

• the last digit is a 0

• it is an even number

• it has a remainder of 10 when divided by 5

Tags

CCSS.4.OA.B.4

Divisible means...

• a number can be divided by another number with no remainder

• there is only one remainder

• a number can be divided by another number

• the answer to a division problem

Tags

CCSS.4.NBT.B.6

CCSS.4.OA.B.4

Two numbers are relatively prime if...

• one number is prime and the other is composite

• both numbers are composite

• their only common factor is 1

• both numbers are prime

Tags

CCSS.6.NS.B.4