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Juanita had 55 postage stamps.Each week she mails 4 letters to her pen pals.What number represents the change in the number of Juanita's stamps after 8 weeks?

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1 Answer

Hi Again Chris;
The short technique...
(55)-[(8)(4)]
55-32=23
 
The long technique...
FIRST WEEK...55-4
SECOND WEEK...51-4
THIRD WEEK...47-4
FOURTH WEEK...43-4
FIFTH WEEK...39-4
SIXTH WEEK...35-4
SEVENTH WEEK...31-4
EIGHTH WEEK...27-4
23