Understanding Factors, Prime, and Composite Numbers

This video tutorial introduces factors, explaining how to determine the factors of a natural number. It defines prime and composite numbers, providing examples for each. The video demonstrates finding factors for numbers like 15, 24, 54, and 120, and explains the concept of prime numbers using 23 as an example. It concludes with a summary of prime and composite numbers, noting that the number one is neither.

What is a factor of a number?

• A number that is greater than the given number

• A number that divides the given number with a remainder

• A number that is a multiple of the given number

• A number that divides the given number without a remainder

Tags

CCSS.4.OA.B.4

Which of the following is NOT a factor of 24?

• 5

• 6

• 12

• 8

Tags

CCSS.4.OA.B.4

What is the correct list of factors for the number 54?

• 1, 2, 3, 6, 9, 18, 27, 55

• 1, 2, 3, 6, 9, 18, 27

• 1, 3, 6, 9, 18, 27, 54

• 1, 2, 3, 6, 9, 18, 27, 54

Tags

CCSS.4.OA.B.4

Which pair of numbers is NOT a factor pair of 120?

• 10 and 12

• 8 and 15

• 7 and 17

• 6 and 20

Tags

CCSS.4.OA.B.4

What defines a prime number?

• A number that is odd

• A number that is even

• A number with exactly two factors: one and itself

• A number with more than two factors

Tags

CCSS.4.OA.B.4

Which of the following numbers is a prime number?

• 23

• 54

• 120

• 24

Tags

CCSS.4.OA.B.4

What is a composite number?

• A number with exactly two factors

• A number with only one factor

• A number with more than two factors

• A number that is neither prime nor composite

Tags

CCSS.4.OA.B.4

Which of the following is NOT a composite number?

• 24

• 54

• 23

• 120

Tags

CCSS.4.OA.B.4

Why is the number 1 neither prime nor composite?

• It has only one factor

• It is an even number

• It has more than two factors

• It has exactly two factors

Tags

CCSS.4.OA.B.4

Which of the following statements is true?

• All even numbers are composite

• All odd numbers are prime

• A composite number has only two factors

• A prime number has only two factors

Tags

CCSS.4.OA.B.4