Identifying Prime Numbers and Sequences

The video tutorial explains how to find prime numbers between 1 and 100 using the Sieve of Eratosthenes. It begins by defining prime numbers and then demonstrates the process of crossing out multiples of each prime starting from 2. The tutorial concludes with a list of the first 25 prime numbers.

What is the range of numbers discussed for finding prime numbers?

• 1 to 200

• 1 to 100

• 1 to 500

• 1 to 50

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

• Has only two factors

• Is divisible by 1 and itself

• Cannot be divided evenly by any other number

• Is always an even number

Why is the number 1 not considered a prime number?

• It is greater than 2

• It is a composite number

• It has only one factor

• It is an even number

What is the first step in identifying prime numbers using the method described?

• Circle 3 and cross out its multiples

• Circle 7 and cross out its multiples

• Circle 2 and cross out its multiples

• Circle 5 and cross out its multiples

After circling 2, which number is the next uncrossed number?

• 3

• 5

• 6

• 4

What should you do after circling 3?

• Cross out all multiples of 3

• Circle 5

• Circle 7

• Cross out all multiples of 5

Which number is circled after 3 in the process?

• 4

• 5

• 7

• 6

What is the next step after circling 5?

• Cross out all multiples of 7

• Circle 7

• Cross out all multiples of 5

• Circle 6

Which number is circled after 5?

• 8

• 7

• 9

• 6

What should be done after circling 7?

• Cross out all multiples of 7

• Circle 8

• Circle 9

• Cross out all multiples of 9