1.2  Fractional Notation             Homework: Odds 5-57

·Natural Numbers- the counting numbers 1,2,3,...
·Factor- to write as a product
·Prime Numbers- a natural number greater than 1 whose only factors are itself and one
·Composite Numbers- a natural number greater than 1 that is not prime
*Notice: 1 is neither prime nor composite
·Prime Factorization- written as a product where all factors are prime

Example: What is the prime factorization of 84?

Fractions:
*Notice: A denominator can NEVER equal 0.

·For

Multiply. Divide.

·For     (1 is called the multiplicative identity)

Simplify.

*Notice: Only cancel factors. (Only cancel when multiplying).

Add. Subtract.


Example:  Simplify .           Example:


Example:                                             Example: 




Example:                                              Example: 



Example: