Identifying Prime and Composite Numbers

The video tutorial explains the difference between prime and composite numbers. A prime number is a whole number greater than one with exactly two factors: one and itself. A composite number has more than two factors. The video provides examples, such as 7 being a prime number and 8 being a composite number. It demonstrates how to determine if a number is prime or composite using divisibility rules, with examples of numbers 27 and 19. The video concludes with a call to action for viewers to like and subscribe.

What is a prime number?

• A number with exactly two factors

• A number with no factors

• A number with more than two factors

• A number with only one factor

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CCSS.4.OA.B.4

Which of the following is an example of a prime number?

• 7

• 10

• 8

• 12

Tags

CCSS.4.OA.B.4

What is a composite number?

• A number with no factors

• A number with more than two factors

• A number with only one factor

• A number with exactly two factors

Tags

CCSS.4.OA.B.4

Which of the following is an example of a composite number?

• 7

• 19

• 27

• 5

Tags

CCSS.4.OA.B.4

What do divisibility rules help us determine?

• If a number is even or odd

• If a number is positive or negative

• If a number is prime or composite

• If a number is a fraction

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CCSS.7.NS.A.1C

What is the sum of the digits of 27?

• 5

• 7

• 9

• 11

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CCSS.4.OA.B.4

Why is 27 considered a composite number?

• It is only divisible by 1 and 27

• It is divisible by 1, 3, 9, and 27

• It is divisible by 1 and 3 only

• It is not divisible by any number

Is 19 divisible by 2?

• Depends on the context

• No

• Only sometimes

• Yes

What is the sum of the digits of 19?

• 11

• 10

• 9

• 8

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CCSS.4.OA.B.4

Why is 19 considered a prime number?

• It is not divisible by any number

• It is divisible by 1 and 19 only

• It is divisible by 1, 2, and 19

• It is divisible by 1, 3, and 19

Tags

CCSS.4.OA.B.4