Exploring Factors, Multiples, and Prime Numbers

Mrs. Gravinis introduces multiplication by explaining factors and multiples. She defines prime numbers as having only two factors, using examples like 5 and 13. She lists the first few prime numbers and highlights that 2 is the only even prime. Composite numbers are then explained as having more than two factors, with examples like 4, 10, and 25. The video concludes with a review of these concepts, emphasizing the difference between prime and composite numbers.

What do we call the numbers that are multiplied together in a multiplication sentence?

• Divisors

• Factors

• Multiples

• Products

In the multiplication sentence 2 x 3 = 6, what is 6 called?

• Factor

• Quotient

• Multiple

• Divisor

Which of the following is a prime number?

• 13

• 4

• 9

• 6

Why is 2 the only even prime number?

• Because all other even numbers have more than two factors

• Because it is the first number in the number line

• Because it is the only even number that cannot be divided by 2

• Because it is the smallest number

Which of the following sets contains only prime numbers?

• 3, 6, 9, 12, 15

• 2, 4, 6, 8, 10

• 1, 2, 3, 4, 5

• 2, 3, 5, 7, 11

What is a composite number?

• A number with only one factor

• A number with exactly two factors

• A number with more than two factors

• A number that cannot be divided

Which of the following is a composite number?

• 5

• 3

• 10

• 2

Why is 9 considered a composite number?

• Because it is less than 10

• Because it has more than two factors

• Because it is even

• Because it is a prime number

Which of the following is NOT a prime number?

• 15

• 11

• 19

• 7

How can you remember the difference between prime and composite numbers?

• Prime numbers have more factors

• Composite numbers are always even

• Composite numbers have more letters and more factors

• Prime numbers are longer words