Prime Numbers A whole number greater than 1 whose only whole number factors are 1 and itself. 2 3 5 17.

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Presentation transcript:

Prime Numbers A whole number greater than 1 whose only whole number factors are 1 and itself

Composite number A whole number greater than 1 that has positive factors other than 1 and itself

Prime factorization Expressing a whole number as a product of prime numbers 2| * 11

DIVISIBILITY RULES 2 -- ends in the sum of the digits is divisible by ends in 0 or divisible by 2 AND sum of digits is divisible by ends in 0

Make a factor tree 20 2 x 10 (2 factors) prime factors 2² ·5

Your Turn

Homework:Page 159 #12 #14 #16 #30 AND Page 160 # READ pages take notes definitions & examples Example: x x x factors (all unique numbers listed) prime factorization 2² ·3² · 17