Evaluation of (81)square
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81=80+1
81×81=(80+1 )(80+1)
6,561=6400+2 (80)(1)+1
6,561=6400+161
6,561=6561
81×81=(80+1 )(80+1)
6,561=6400+2 (80)(1)+1
6,561=6400+161
6,561=6561
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