Exploring Prime and Composite Numbers

What is a factor?

• A composite number that can be divided by another number.

• A prime number that divides another number.

• A number that can be multiplied by another number to get a third number.

• A number that divides another number without leaving a remainder.

Tags

CCSS.4.OA.B.4

Why can't the number 1 be considered prime or composite?

• Because it is the multiplicative identity

• Because it does not meet the definition of prime or composite numbers

• Because it is divisible by every number

• Because it has only one factor

Tags

CCSS.4.OA.B.4

What defines a prime number?

• A number with exactly two factors.

• A number with more than two factors.

• A number that is divisible by itself only.

• A number that is divisible by 1 and itself.

Tags

CCSS.4.OA.B.4

Which of the following is NOT a characteristic of prime numbers?

• Cannot be divided evenly by other prime numbers

• Having more than two factors

• Being divisible by 1 and itself

• Having exactly two factors

Tags

CCSS.4.OA.B.4

Which of the following is a composite number?

• 2

• 5

• 4

• 3

Tags

CCSS.4.OA.B.4

How many factors does a composite number have?

• Exactly two

• More than three

• Less than three

• Three or more

Tags

CCSS.4.OA.B.4

Is the number 5 prime or composite?

• Both

• Neither

• Composite

• Prime

Tags

CCSS.4.OA.B.4

Which of the following numbers is prime?

• 51

• 43

• 60

• 42

Tags

CCSS.4.OA.B.4

What method can help identify prime numbers among larger numbers?

• Memorizing all prime numbers

• Dividing the number by two

• Using a multiplication chart

• Looking at a chart with highlighted prime numbers

Tags

CCSS.4.OA.B.4

What mistake do students often make with the number 22?

• Forgetting it's prime

• Counting it as a prime number

• Thinking it has only two factors

• Forgetting to divide it by 2

Tags

CCSS.4.OA.B.4