Multification 11 with any number of three digits

1.
213*11 =  take 2 then take 2 and 1 and add them then take 1 and 3 and add them and then take 3
            = so  2    (2+1)     (1+3)    3
            = so ans is 2343

another example is
352*11 = 3   (3+5)    (5+2)    2
            = so ans is 3872

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