Understanding Prime and Composite Numbers

The video tutorial on the Space Math Channel introduces prime and composite numbers. Prime numbers are defined as whole numbers with only two divisors: one and themselves. Examples like 5 and 11 are used to illustrate this concept. Composite numbers, on the other hand, have more than two divisors, as shown with the example of 4. The video also explains how to identify prime numbers using smaller prime numbers and divisibility criteria. Interactive exercises are provided to reinforce learning, and interesting facts about numbers 1 and 2 are shared. The video concludes with a reminder of key rules about divisors.

What is a prime number?

• A number with exactly two divisors

• A number that is even

• A number with only one divisor

• A number with more than two divisors

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CCSS.4.OA.B.4

Why is the number five considered a prime number?

• It can be divided by three

• It has more than two divisors

• It can only be divided by one and itself

• It is an even number

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CCSS.4.OA.B.4

What makes a number composite?

• It has exactly two divisors

• It has more than two divisors

• It is an odd number

• It has only one divisor

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CCSS.4.OA.B.4

Which of the following is a divisor of the number four?

• Seven

• Two

• Five

• Three

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CCSS.4.OA.B.4

How can you determine if a number is prime?

• By dividing it by smaller prime numbers

• By dividing it by all even numbers

• By checking if it is odd

• By adding its digits

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CCSS.4.OA.B.4

What is the result when dividing a prime number by a smaller prime number?

• A quotient of zero

• A remainder

• A remainder of zero

• An exact division

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CCSS.4.OA.B.4

Is the number 17 a prime or composite number?

• Both

• Composite

• Prime

• Neither

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CCSS.4.OA.B.4

Why is the number nine considered a composite number?

• It has only one divisor

• It is a prime number

• It has more than two divisors

• It has exactly two divisors

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CCSS.4.OA.B.4

Why is the number one not considered a prime number?

• It is even

• It has only one divisor

• It is a composite number

• It is odd

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CCSS.4.OA.B.4

What is unique about the number two among prime numbers?

• It is the only odd prime number

• It is the largest prime number

• It is the only even prime number

• It has more than two divisors

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CCSS.4.OA.B.4