Identifying Prime and Composite Numbers

In this math class video, the teacher explores multiplication by focusing on prime and composite numbers. Prime numbers are defined as numbers greater than one with only two factors: one and itself. An example given is the number seven. Composite numbers have more than two factors, such as the number eight. The teacher introduces strategies to determine if a number is prime or composite, using area and array models. For instance, the number seven can only be arranged in a single row of seven boxes, indicating it is prime. In contrast, the number eight can be arranged in multiple ways, showing it is composite. The video concludes with a summary of the differences between prime and composite numbers.

What is the main topic introduced in this math class?

• Geometry and shapes

• Prime and composite numbers

• Fractions and decimals

• Addition and subtraction

Which of the following is a characteristic of a prime number?

• It is an even number

• It is a multiple of ten

• It has more than two factors

• It has exactly two factors

Which number is given as an example of a prime number?

• Eight

• Four

• Seven

• Ten

What defines a composite number?

• A number with only one factor

• A number that is a square

• A number with exactly two factors

• A number with more than two factors

Which number is used as an example of a composite number?

• Five

• Eight

• Three

• Seven

What is one strategy mentioned for identifying prime and composite numbers?

• Using area and array models

• Using a number line

• Using a multiplication table

• Using a calculator

How can an array model help identify a prime number?

• By showing only one row or column

• By showing a circle

• By showing a triangle

• By showing multiple rows and columns

What array can be made for the number seven?

• 2 * 3

• 3 * 3

• 4 * 2

• 7 * 1

How many different arrays can be made for the number eight?

• One

• Two

• Three

• Four

Which array is NOT possible for the number eight?

• 8 * 1

• 2 * 4

• 4 * 2

• 3 * 3