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MATH

MATH. Prime Numbers. Definition of a Prime Number. A prime number is a number which has exactly two factors… In other words, a prime number is a number greater than 1 that has no factors other than 1 and itself Numbers which have more than two factors are called composite numbers ….

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MATH

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  1. MATH Prime Numbers

  2. Definition of a Prime Number • A prime number is a number which has exactly two factors… • In other words, a prime number is a number greater than 1 that has no factors other than 1 and itself • Numbers which have more than two factors are called composite numbers…

  3. Examples of Prime Numbers NumberFactors 2 (1,2) 3 (1,3) 5 (1,5)

  4. Examples of Composite Numbers NumberFactors 4 (1,2,4) 6 (1,2,3,6) 8 (1,2,4,8)

  5. What about 1? • Has only one factor (1) • Does not meet the definition of prime or composite

  6. Using Prime Numbers • Factoring • Factoring is finished when each factor is a prime number

  7. 6 3 x 2 Both factors, 3 and 2 are prime numbers 15 5 x 3 Both factors, 5 and 2 are prime numbers Examples of Factoring

  8. Examples of Factoring 36 4 x 9 2 x 2 x 9 2 x 2 x 3 x 3 The factor tree is not finished until all factors are prime 4 and 9 and not prime numbers

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