Understanding Prime and Composite Numbers

The video tutorial introduces the concepts of prime and composite numbers, explaining that prime numbers have exactly two factors, while composite numbers have more than two. It emphasizes the importance of understanding factors through multiplication examples. The tutorial demonstrates how to use a divisibility chart to determine if a number is prime or composite, especially for larger numbers. Several examples are provided to illustrate the process, and the video concludes with tips on effectively using the divisibility chart.

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

Which of the following is a composite number?

• 5

• 2

• 3

• 4

What is the purpose of a divisibility chart?

• To identify prime and composite numbers

• To divide numbers

• To add numbers

• To subtract numbers

If a number is divisible by 3 and gives a whole number, what can we conclude?

• The number is even

• The number is odd

• The number is composite

• The number is prime

What is the result of dividing 51 by 3?

• 15

• 16

• 17

• 18

Why is 67 considered a prime number?

• It has more than two factors

• It is divisible by 10

• It has exactly two factors

• It is divisible by 5

What is the result of dividing 73 by 2?

• 36

• 37

• 35

• 36.5

Which number is a factor of 57?

• 4

• 3

• 2

• 5

What should you do if you get a decimal result when using the divisibility chart?

• Consider the number as prime

• Consider the number as composite

• Try dividing by another number

• Ignore the result

Why is it unnecessary to use a divisibility chart for numbers less than 30?

• They are all prime

• They are all composite

• Their factors are easily known

• They cannot be divided