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Prime and Composite Numbers

Prime and Composite Numbers. When Will I Ever Use Prime and Composite Numbers?. If you are baking cupcakes for a birthday party, you will be able to know if the amount you baked can be divided evenly between your friends.

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Prime and Composite Numbers

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  1. Prime and Composite Numbers

  2. When Will I Ever Use Prime and Composite Numbers? • If you are baking cupcakes for a birthday party, you will be able to know if the amount you baked can be divided evenly between your friends. • Will you have leftovers? If it is a prime number, you know there will be leftovers!

  3. When Will I Ever Use Prime and Composite Numbers? • On Field Day, there is a certain amount of minutes that everyone gets to be able to get to all of the stations. • The field day planners must know if they can split the time that they have so that everyone can get the same amount of time at each station! • If the number of minutes is a prime number, then there will be extra minutes left over!

  4. What is a prime number? My only factors are 1 and Me, 5! • A number that only has two factors, 1 and itself. PR I ME • If you look at the word, • The letter “I” looks like the number 1. • The word “ME” is that the end. • Prime numbers only have factors of 1 + ME!

  5. What is a composite number? • A composite number is a number that has more than 2 factors. • Example: What are the factors of 10? _________________ • The number 10 has more factors than just 1 and itself!

  6. 2: Prime or Composite? • 2 is the first multiple of two AND an even number, so it must be composite, right? WRONG! The only factors of two are 1 and itself. …This makes 2 a prime number!

  7. How can we figure out if a number is Prime or Composite? • Let’s start with a hundreds chart • We can cross out the multiples of numbers in order. • What is left, that doesn’t get crossed out, are prime numbers! • We are going to start with counting by 2’s. Cross out each multiple of 2, except 2! • Then we’ll do 3, then 4, and so on.

  8. Directions • Cross out all of the multiples of 2. (Remember to skip the number 2, it is prime!) • Cross out all of the multiples of 3. • Cross out all of the multiples of 4. • Cross out all of the multiples of 5, 6, 7, 8, 9, 10, 11, and 12. • Circle the Number 1. It is neither Prime Nor Composite. • Highlight the numbers that have not been crossed out. These are prime numbers! (Don’t highlight 1)

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