Finding Square Of Adjacent Number
You know the squares of 30, 40, 50, 60 etc. but if you are required to calculate square of 31 or say 61 then you will scribble on paper and try to answer the question. Can it be done mentally? Some of you will say may be and some of you will say may not be. But if I give you a formula then all of you will say, yes! it can be. What is that formula…..
The formula is simple and the application is simpler.
Say you know 60^2 = 3600
Then 612 will be given by the following
61^2 = 60^2 + (60 + 61) = 3600 + 121 = 3721
or Say you know 25^2 = 625 then
26^2 = 625 + (25 + 26) = 676
Like above, you can find out square of a number that is one less than the number whose square is known.
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