How to solve square number between 40 and 49 /very easy method solve in second

this is very easy method. this is short tricks you can solve in second but this method can apply to only square number between 40 to 49. it's mean it can apply 40, 41, 42, 43, 44, 45, 46, 47, 48, 49. for solving this square number some tricks is apply that is
Step 1 :- subtract the number using 50
Step 2 :- substract the result from step 1
                from 25
Step 3 :- square the result of step 1 ( if the                    result is single digit put the 0 in                        front of it )
Step 4 :- put the result first step 2 then next                  step 3

Ex. 47square
Step 1 :- 50 - 47 = 03
Step 2 :- 25 - 03 = 22
Step 3 :- 03square= 09
Step 4 :- 22_09
               = 2209

Ex. 42square
Step 1 :- 50 - 42 = 08
Step 2 :-  25 - 08 = 17
Step 3 :- 08square = 64
Step 4 :- 17_64 = 1764
 42square = 1764

Solve more problem for practice
For video learning follow this link
https://youtu.be/NpafAUJo-bg
           https://youtu.be/NpafAUJo-bg

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