Divisibility Rules and Prime Numbers

The video tutorial explains how to determine if a house number is prime. It begins by defining a prime number as a whole number greater than one that is only divisible by 1 and itself. The tutorial then eliminates non-prime options by using divisibility rules, such as even numbers not being prime (except for 2) and numbers divisible by 3. The process of elimination leads to the conclusion that 89 is the prime number among the choices.

What is the main problem discussed in the video?

• Finding the street address of Jack's house

• Determining if Jack's house number is a prime number

• Calculating the sum of Jack's house number

• Identifying the color of Jack's house

Which of the following best describes a prime number?

• A number that ends with zero

• A number divisible by 2 and 3

• A whole number greater than one, only divisible by 1 and itself

• A number that is a multiple of 5

What is the only even prime number?

• 2

• 4

• 8

• 6

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

• It is a multiple of 10

• It is always greater than 100

• It is only divisible by 1 and itself

• It is always even

Why is the number 299 not considered a prime number?

• It is less than 100

• It is an even number

• It is divisible by 3

• It is the product of 9 and 11

What is the divisibility trick mentioned for the number 87?

• Subtract the digits and see if the result is a prime number

• Multiply the digits and check if the product is even

• Check if it ends with 7

• Add the digits and see if the sum is divisible by 3

Which of the following numbers is not divisible by 3?

• 99

• 89

• 90

• 87

What is the product of 9 and 11?

• 81

• 99

• 100

• 299

Which number is not a prime number?

• 3

• 89

• 299

• 2

What is the sum of the digits of 87?

• 16

• 17

• 14

• 15