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                LESSONS:  | 
                * calculator link  | 
               
             
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          Number Systems (Reals, Naturals, Whole, Integers, Rationals, Irrationals)  | 
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          Rational Numbers  (defn, examples, converting fraction-decimal, number line, signs)  | 
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          Review  | 
         
        
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          Review    | 
         
        
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          Review    | 
         
        
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          Review    | 
         
     
       
       
      
        
          PRACTICE:  | 
         
        
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          Review  | 
         
        
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          Review    | 
         
        
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              and up 
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