Exploring Prime and Composite Numbers

The video tutorial explains the difference between prime and composite numbers, using examples to illustrate each concept. It discusses special numbers like 0 and 1, which are neither prime nor composite. The tutorial provides strategies for identifying prime and composite numbers without relying on charts, focusing on factors and divisibility rules for numbers like 2, 3, 5, and 10. The video aims to equip students with the skills to determine the nature of numbers independently.

What is a prime number?

• A number with exactly two factors.

• A number with more than two factors.

• A number with only one factor.

• A number with no factors.

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CCSS.4.OA.B.4

Which of the following is a prime number?

• 4

• 6

• 7

• 9

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CCSS.4.OA.B.4

What makes a number composite?

• It has more than two factors.

• It has only one factor.

• It has exactly two factors.

• It has no factors.

Tags

CCSS.4.OA.B.4

Which of the following numbers is neither prime nor composite?

• 2

• 5

• 0

• 3

Tags

CCSS.4.OA.B.4

Why is the number 2 special among prime numbers?

• It is the only odd prime number.

• It is neither prime nor composite.

• It is the only even prime number.

• It has more than two factors.

Tags

CCSS.4.OA.B.4

Which number does not have 2 as a factor?

• 84

• 98

• 67

• 106

Tags

CCSS.4.OA.B.4

If the sum of the digits of a number is divisible by 3, what can be said about the number?

• It is divisible by 5.

• It is divisible by 3.

• It is a composite number.

• It is a prime number.

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CCSS.3.OA.D.9

Which number has 5 as a factor?

• 55

• 80

• 90

• 897

Tags

CCSS.4.OA.B.4

Which number does not have 10 as a factor?

• 90

• 80

• 50

• 105

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CCSS.4.OA.B.4

What should you do if a number has more than two factors?

• Label it as prime.

• Label it as composite.

• Label it as even.

• Label it as neither prime nor composite.

Tags

CCSS.4.OA.B.4