Divisibility Rules

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.

Front

What is the divisibility rule for 5?

Back

The last digit of the number must be a 5 or 0.

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.

Front

What are the numbers 0 and 1 classified as?

Back

Neither prime nor composite.

Front

Is 555,509 divisible by 3?

Back

No.

Front

Find the missing number that makes 34,7_6 divisible by 9. What is the missing number?

Back

7.

Front

What is a prime number?

Back

A prime number is a whole number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is a composite number?

Back

A composite number is a whole number greater than 1 that has more than two positive divisors.

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).

Front

What is the divisibility rule for 4?

Back

A number is divisible by 4 if the last two digits form a number that is divisible by 4.