•How many    in.   is  12.0 pm?
•(1) Identify the given quantity and its unit; identify the unit sought
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•2) Gather useful unit-factors and outline a logical, systematic sequence of  conversions
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•(3)  Set  up conversions,  following  your outline and verifying the proper  placement of  units in the unit factors.
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•(4)  Place appropriate numbers in the unit factors and carry out in indicated operations
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            1x10-10  cm
¾¾¾¾
1   pm
  cm
¾¾ x
   pm
 given           sought
  pm
cm
in
pm  x
in
¾¾         cm
=  in
12.0  pm
     1 in
   ¾¾
    2.54 cm
 4.72 x 10-10  in
 1 pm   =  
1 x 10-10
cm
1 in = 2.54 cm
  12.0 pm
inches
x
x
=