Prime and composite

Front

Is 5 prime or composite?

Back

Prime, because it has two factors: 1 and 5.

Front

What is a prime number?

Back

A prime number is a number that has ONLY two factors: 1 and itself.

Front

Is 21 prime or composite?

Back

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

Front

What is a composite number?

Back

A composite number is a number that has MORE than two factors.

Front

Find the missing multiple: 10: 10, 20, 30, 40, ___, 60, 70, 80

Back

50

Front

What is the next multiple? 12, 24, 36, 48, _____

Back

60

Front

Is 1 a prime number?

Back

No, 1 is neither prime nor composite because it has only one factor.

Front

What are the first five prime numbers?

Back

2, 3, 5, 7, 11.

Front

What are the first five composite numbers?

Back

4, 6, 8, 9, 10.

Front

How can you tell if a number is prime?

Back

A number is prime if it has exactly two distinct positive divisors: 1 and itself.