Pre-Algebra 09 - Division and Prime Numbers

The video tutorial by Professor Von Schmohawk at WHY U covers the four basic arithmetic operations, focusing on division as the inverse of multiplication. It explains two interpretations of division and discusses factors, divisors, prime, and composite numbers. The Sieve of Eratosthenes is introduced as a method to identify prime numbers. The video also provides tricks for determining divisibility by primes and highlights the ongoing quest to find large prime numbers.

What is the result of dividing 6 by 3 using the interpretation of how many times one number fits into another?

• 4

• 3

• 2

• 1

Which of the following numbers is a divisor of 6?

• 7

• 9

• 5

• 3

Which number is not considered a prime number?

• 1

• 3

• 5

• 2

What is the product of the prime numbers that make up the composite number 10?

• 2 and 7

• 3 and 5

• 2 and 5

• 2 and 3

What is the process called that eliminates composite numbers to find primes?

• Division Method

• Prime Factorization

• Multiplication Table

• Sieve of Eratosthenes

Which of the following numbers is composite because it ends with 0?

• 23

• 17

• 45

• 60

If a number's digits sum to 15, is it divisible by 3?

• Yes

• No

• Only if it's even

• Only if it's odd