Prime and composite numbers

power point presentation -Prime and Composite Number by Geraldine Martin

1. Prime and Composite Numbers by: Geraldine C. Martin

2. Lets Learn! A prime number has exactly two factors, one and itself. A composite number has more than two factors. One is neither prime nor composite . It only has itself as a factor. Two is the only even prime number . The method in finding prime number is called prime factorization .

3. The following are examples of prime numbers and composite number. Prime Numbers Factors 3 1 and 3 5 1 and 5 13 1 and 13 29 1 and 29 31 1 and 31 Composite Numbers Factors 4 1, 2, and 4 6 1, 2, 3 and 6 8 1, 2, 4 and 8 9 1, 3 and 9 12 1, 2, 3, 4, 6 and 12

4. Prime Factorization Prime factorization is when you break a number down into its prime factors. The prime factorization of a number is the product of primes that make up that number. Every number has a unique prime factorization . Factor tree and division by primes are one of the methods in finding prime factors.

5. Example 1 . Find the prime factors of 36 using factor tree. 1. Start with any two factors. 2. Continue finding factors until you reach all prime factors of the given number. So, the prime factor of 36 is 3 x 3 x 2 x 2 or 3 2 x 2 2 .

6. Example 2 . Find the prime factors of 108 using factor tree. The prime factor of 108 is 2 x 2 x 3 x 3 x 3 or 2 2 x 3 3 .

7. Example 3 . Find the prime factors of 120 using division by prime method. So, the prime factor of 120 is 2 x 2 x 2 x 3 x 5 or 2 3 x 3 x 5.

8. Example 4. Find the prime factors of 144 using division by prime method. T he prime factor of 144 is 2 x 2 x 2 x 2 x 3 x 3 or 2 4 x 3 3 .