Exploring Prime and Composite Numbers

What is a prime number?

• A number with exactly two factors: 1 and itself.

• A number that is always even.

• A number that can be divided by numbers other than 1 and itself.

• A number with more than two factors.

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CCSS.4.OA.B.4

Which of the following is a prime number?

• 6

• 4

• 3

• 9

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CCSS.4.OA.B.4

How can you determine if a number is prime?

• By finding more than two factors.

• By using only multiplication.

• By checking if it can be divided evenly only by 1 and itself.

• By adding the number to itself.

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CCSS.4.OA.B.4

What should you do to determine if a number is prime or composite?

• Check if it has more than two factors.

• Multiply it by itself.

• Divide it by two and check for a remainder.

• Add it to a known prime number.

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CCSS.4.OA.B.4

What makes a number a composite number?

• It has exactly two factors.

• It is always an odd number.

• It has more than two factors.

• It is divisible by only two numbers.

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CCSS.4.OA.B.4

Which of the following numbers is composite?

• 13

• 11

• 8

• 7

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CCSS.4.OA.B.4

How can you prove a number is composite?

• By dividing it by any prime number.

• By subtracting one from it.

• By demonstrating it has more than two factors.

• By showing it has only two factors.

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CCSS.4.OA.B.4

Why is the number 2 considered a prime number?

• It has exactly two factors: 1 and itself.

• It has more than two factors.

• It can be divided by numbers other than 1 and 2.

• It is divisible by all even numbers.

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CCSS.4.OA.B.4

What is unique about the number 2 among prime numbers?

• It has three factors.

• It is the largest prime number.

• It is the smallest prime number.

• It is the only even prime number.

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CCSS.4.OA.B.4

Which statement is true for every even number greater than 2?

• It cannot be divided by 2.

• It has exactly three factors.

• It is a prime number.

• It is a composite number.

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CCSS.4.OA.B.4