Exploring the World of Prime Numbers

The video tutorial introduces prime numbers, explaining that they have exactly two factors: one and the number itself. It clarifies that one is not a prime number and lists the first eight prime numbers. The video distinguishes between prime and composite numbers, noting that one is neither. It identifies prime numbers between 20 and 30 and demonstrates how to express 60 as a product of prime numbers using factorization.

What is a prime number?

• A number with only one factor

• A number with exactly two factors

• A number that is even

• A number with more than two factors

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CCSS.4.OA.B.4

Why is the number one not considered a prime number?

• Because it is an even number

• Because it is greater than two

• Because it is a composite number

• Because it has only one factor

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CCSS.4.OA.B.4

Which of the following is the first prime number?

• 3

• 4

• 1

• 2

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CCSS.4.OA.B.4

Why is the number nine not a prime number?

• Because it is even

• Because it has more than two factors

• Because it is less than ten

• Because it is a unitary number

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CCSS.4.OA.B.4

What do we call numbers that are not prime?

• Even

• Unitary

• Composite

• Odd

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CCSS.4.OA.B.4

What is the special name given to the number one?

• Prime

• Composite

• Unitary

• Even

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CCSS.4.OA.B.4

Which of the following numbers between 20 and 30 is a prime number?

• 21

• 27

• 23

• 25

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CCSS.4.OA.B.4

Why is the number 27 not a prime number?

• Because it is even

• Because it is less than 30

• Because it has more than two factors

• Because it is a unitary number

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CCSS.4.OA.B.4

Which of the following is a correct factorization of 60 into prime numbers?

• 3 x 3 x 3 x 5

• 2 x 2 x 3 x 5

• 2 x 3 x 5 x 5

• 2 x 2 x 2 x 5

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CCSS.4.OA.B.4

What is the product of 2, 2, 3, and 5?

• 120

• 90

• 60

• 30