# Factors and Prime Numbers

Taught by YourMathGal
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Lesson Summary:

In this lesson, we learn about factors and prime numbers. Factors are the numbers that are multiplied together to get a product. We can easily find the factors of a number by listing all the numbers that go into it. A prime number is a number that has exactly two factors, 1 and itself. We can determine if a number is prime by checking if it is divisible by any number other than 1 and itself. The lesson ends with a list of odd numbers up to 105 and how to determine which ones are prime using the divisibility tests.

Lesson Description:

Defines factors and prime numbers, and how to determine if a number is prime or not.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

• What are Prime Numbers - Gives you more information on What are Prime Numbers? types,properties and list of prime numbers.
• What is a factor?
• What are the prime factors of 42?
• What are some factors of 24?
• How do you find all the factors of 15?
• What are divisibility tests?
• How do you know if 2, 3, or 5 go into a number?
• What is a prime number?
• How do you know if a number is a prime number?
• Which numbers between 2 and 105 are prime?
• #### Staff Review

• Currently 4.0/5 Stars.
This lesson is a very basic introduction to factors. It starts out with a definition of what a factor is, how to find the factors of a number, and a review of divisibility tests for some numbers. Several examples of finding factors are shown. Also, prime numbers and prime factors are explained, and you will see which numbers between 2 and 105 are prime.