FINDING square number ending with 5

this is method of solving square number ending with 5 or last in 5
This method is applicable only this digit which last digit is 5. this is so easy method for solving square number
So what happened in this
 step 1:- multiply first digit by first digit plus one
Step 2 :- write the number 25 next to the result from step 1

There is show some image for explained and I give some problems for solving ,solve by the method. and Be practice

Solve this problem by using tricks






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