Prime and composite

Front

What is a prime number?

Back

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

Front

Is 1 a prime number?

Back

No, 1 is neither prime nor composite.

Front

What are the first five prime numbers?

Back

The first five prime numbers are 2, 3, 5, 7, and 11.

Front

What are the first five composite numbers?

Back

The first five composite numbers are 4, 6, 8, 9, and 10.

Front

How can you tell if a number is composite?

Back

A number is composite if it can be divided evenly by numbers other than 1 and itself.

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder.

Front

What is a multiple?

Back

A multiple of a number is the product of that number and an integer.

Front

Is 27 a prime or composite number?

Back

Composite, because it has factors 1, 3, 9, and 27.

Front

Is 21 a prime or composite number?

Back

Composite, because it has factors 1, 3, 7, and 21.