Exploring Prime and Composite Numbers

What should you be comfortable with before starting this lesson?

• Geometry and algebra

• Addition and subtraction

• Multiplication and division

• Fractions and decimals

Tags

CCSS.3.OA.D.9

Which of the following is a prime number?

• 7

• 6

• 4

• 9

Tags

CCSS.4.OA.B.4

Why is the number 5 considered a prime number?

• It is an odd number

• It has only two factors: 1 and 5

• It is less than 10

• It is a single-digit number

Tags

CCSS.4.OA.B.4

Which of the following numbers is composite?

• 9

• 5

• 3

• 2

Tags

CCSS.4.OA.B.4

What are the factors of the number 15?

• 1, 5, 10, 15

• 1, 3, 5, 15

• 1, 3, 7, 15

• 1, 2, 3, 15

Tags

CCSS.4.OA.B.4

Why is the number 1 neither prime nor composite?

• It is an even number

• It is a single-digit number

• It is an odd number

• It has only one factor: itself

Tags

CCSS.4.OA.B.4

Which of the following numbers is prime?

• 21

• 17

• 50

• 51

Tags

CCSS.4.OA.B.4

What is a common misconception about even numbers?

• All even numbers are prime

• All even numbers are composite

• Even numbers cannot be prime

• Even numbers are always greater than odd numbers

Tags

CCSS.3.OA.D.9

Which of the following numbers is composite?

• 50

• 5

• 3

• 2

Tags

CCSS.4.OA.B.4

What did we learn about numbers that can be divided by more than two numbers?

• They are prime

• They are composite

• They are neither prime nor composite

• They are special cases

Tags

CCSS.4.OA.B.4