Divisibility rules

Front

What is a divisibility rule?

Back

A divisibility rule is a shortcut that helps determine whether a number can be divided by another number without performing the actual division.

Tags

CCSS.3.OA.D.9

Front

What is the divisibility rule for 2?

Back

A number is divisible by 2 if its last digit is even (0, 2, 4, 6, or 8).

Tags

CCSS.3.OA.D.9

Front

What is the divisibility rule for 3?

Back

A number is divisible by 3 if the sum of its digits is divisible by 3.

Tags

CCSS.4.OA.B.4

Front

What is the divisibility rule for 5?

Back

A number is divisible by 5 if its last digit is 0 or 5.

Tags

CCSS.2.OA.C.3

Front

What is the divisibility rule for 6?

Back

A number is divisible by 6 if it is divisible by both 2 and 3.

Tags

CCSS.3.OA.D.9

Front

What is the divisibility rule for 9?

Back

A number is divisible by 9 if the sum of its digits is divisible by 9.

Tags

CCSS.3.OA.D.9

Front

What is the divisibility rule for 10?

Back

A number is divisible by 10 if its last digit is 0.

Tags

CCSS.3.OA.D.9

Front

How can you check if a number is divisible by 4?

Back

A number is divisible by 4 if the number formed by its last two digits is divisible by 4.

Tags

CCSS.3.OA.D.9

Front

What is the significance of the sum of digits in divisibility rules?

Back

The sum of digits is used in the rules for divisibility by 3 and 9 to determine if a number is divisible by these values.

Tags

CCSS.3.OA.D.9

Front

Is 252 divisible by 9?

Back

Yes, because the sum of its digits (2 + 5 + 2 = 9) is divisible by 9.

Tags

CCSS.4.OA.B.4