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Q&A #522

Teachers' Lounge Discussion: Teaching subtraction

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From: raj <rrmpk@rediffmail.com>
To: Teacher2Teacher Public Discussion
Date: 2001062505:55:48
Subject: subtraction from zeroes

	aneasier way to subtract from zeroes is described here which
eliminates the confusion of borrowing:

           ex:
                  24000
             -    12345
                 ---------

assume first 0 to be 10.subtrract 5 from this 10 and get 5.add 1 to 4
and make it 5.again assume next zero as 10 and subtract 5 from new
10.now add 1 to number '3' and make it 4.subtract this 4 from next
zero which is assumed as zero.now add 1 to number '2'and make it
'3'.subtract this 3 from number 4 and get 1.last number can be
subtracted in usual manner.the process can be shown as follws:

               2   4        0(10)        0(10)        0(10)

          -    1   2(+1)    3(+1)        4(+1)        5 
       -----------------------------------------------------------
               1   1        6            5            5
                      
this method can also used to subtract any bigger number from lower
number starting from unity which is asuumed a tens number.hope it
works with your students.

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