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  When we  subtract zero from a number the answer will be
                       the number itself.  Ex- 5-0=5

                     When we subtract 1 from a number the answer will be the
                       before number or previous number.  Ex- 9-1=8

                     When we subtract a number from the number itself the
                       answer will be zero. Ex-6-6=0


               Learning Outcome- Students can recognize the fact of
               subtraction of zero, one and the number itself.
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