Understanding Prime Numbers

This video tutorial explains the concept of prime numbers, which are natural numbers divisible only by 1 and themselves. The instructor provides examples and clarifies common misconceptions, such as the number 1 not being a prime number. The video also highlights that 2 is the only even prime number and lists the first few prime numbers. The tutorial concludes with a summary and encourages viewers to engage with the content.

What is a prime number?

• A number divisible by 1 and itself only

• A number divisible by 1, 2, and itself

• A number divisible by 1, 2, 3, and itself

• A number divisible by any two numbers

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CCSS.4.OA.B.4

Why is the number 1 not considered a prime number?

• It is divisible by more than two numbers

• It is only divisible by itself

• It is divisible by 1 and itself, but not two distinct numbers

• It is divisible by 1 and 2

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CCSS.4.OA.B.4

Which of the following numbers is a prime number?

• 2

• 6

• 8

• 4

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CCSS.4.OA.B.4

Why is the number 4 not a prime number?

• It is divisible by 1, 2, and 4

• It is divisible by 1, 3, and 4

• It is only divisible by 1 and 4

• It is divisible by 1 and itself only

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CCSS.4.OA.B.4

Which number is the only even prime number?

• 4

• 8

• 6

• 2

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CCSS.4.OA.B.4

What makes the number 5 a prime number?

• It is divisible by 1, 3, and 5

• It is divisible by 1 and 5 only

• It is divisible by 1, 4, and 5

• It is divisible by 1, 2, and 5

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CCSS.4.OA.B.4

Which of the following numbers is not a prime number?

• 11

• 13

• 7

• 9

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CCSS.4.OA.B.4

Why is the number 9 not considered a prime number?

• It is divisible by 1, 4, and 9

• It is divisible by 1, 2, and 9

• It is divisible by 1 and 9 only

• It is divisible by 1, 3, and 9

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CCSS.4.OA.B.4

What is a quick tip to identify non-prime even numbers?

• Even numbers greater than 2 are prime

• All even numbers are non-prime

• Only the number 2 is an even prime number

• All even numbers are prime

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CCSS.4.OA.B.4

Which of the following lists contains only prime numbers?

• 2, 3, 5, 7

• 4, 6, 8, 10

• 9, 11, 13, 15

• 12, 14, 16, 18

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CCSS.4.OA.B.4