Arithmetic and Scientific Notation
•Multiplication:  Multiply the mantissa
         Add the exponents
•
•20 AU = (2 ´ 101 ) ´ (1.496 ´108 km)
 
      = (2 ´ 1.496) ´  (101 x 108) km
      =   2.9992    ´      109       km
•
•Division:        Divide the mantissa
       Subtract the exponents
•1 AU / 500 = (1.496 ´108 km) / (5 ´ 102)
           = (1.496 / 5 ) ´  (108 / 102) km
•
           =  0.2992      ´      106     km
           =  2.992       ´      105     km
•
•Be careful when adding or subtracting:
•  (2.0´106) + (2.0´103) = 2,002,000 = 2.002´106
                              not 4.   ´106