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GMAT > Learn GMAT Coaching > Short - Cut For Squaring Two-Digit Numbers
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Short - Cut For Squaring Two-Digit Numbers [May Also Be Extended To Three-Digit And Four-Digit Numbers As Well]

I
Intellect Growth Management
31/05/2017 0 0

Square of a two-digit number:

Quick Method:

(82)2= 6404

            32 [8*2*2]  ==> 8 and 2 from original number itself and another 2 from the power of 82 i.e. 2

          6724

Likewise for square of 79:

(79)2= 4981

           126 [7*9*2]

           6241   ==> Final Answer

Likewise for square of 63:

   (63)2

= 3609

  + 36

= 3969 ==>Final Answer

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