Understanding Prime and Composite Numbers

The video tutorial explains the concepts of prime and composite numbers, detailing how to find factors using a T-chart. It provides examples with numbers 18, 36, and 17, demonstrating the process of identifying factors and determining if a number is prime or composite. The video also introduces the concept of square numbers, using 36 as an example.

What is a prime number?

• A number with exactly two factors.

• A number with no factors.

• A number with only one factor.

• A number with more than two factors.

Which of the following is a composite number?

• 2

• 3

• 4

• 5

What is the first step in finding factors using a T-chart?

• Divide the number by 2.

• Multiply the number by itself.

• Draw a T-chart with numbers 1 through 9.

• List all even numbers.

What are the factors of 18?

• 1, 2, 4, 8, 16

• 1, 3, 5, 15

• 1, 2, 3, 6, 9, 18

• 1, 2, 3, 5, 10

Why is 18 considered a composite number?

• It has exactly two factors.

• It has more than two factors.

• It is an even number.

• It is a prime number.

What is the significance of a T-chart in finding factors?

• It identifies prime numbers directly.

• It divides numbers into even and odd.

• It multiplies numbers automatically.

• It helps list all possible factors.

How can you determine if a number is composite?

• It has exactly two factors.

• It is a square number.

• It has more than two factors.

• It is an odd number.

What is the purpose of counting by numbers when finding factors?

• To find factor pairs

• To determine if a number is even

• To calculate square numbers

• To identify prime numbers

Which of the following is a characteristic of composite numbers?

• They have exactly two factors.

• They are always odd.

• They are always even.

• They have more than two factors.

Which of the following is a factor of 18?

• 11

• 5

• 9

• 7