FINDING SQUARES FROM 21 TO 30

In the last post you learned how to find squares from 11

11² =11+1 ,1² =121

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To day let us find 21² to 30²

21² = 2X(21+1) ,1² =441

22² = 2X(22+2) ,2² =484

23² = 2X(23+3) ,3² = 529

24² = 2X(24+4) ,4² = 56,16 =576(carry 1 & add it to56)

25² = 2X(25+5) ,5² = 60 ,25 =625 (carry 2 & add it to 60)

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Similarly

31² = 3(31+1) ,1² =961

32² = 3(32+2) ,2² =1024

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