Easiest method to find square of any number between 10 to 19.

• Step 1) Add given no & unit digits.
• Step 2) Then square the unit digit & put the number next to the result obtained in step 1.

e.g. 1)  (12)^2

        Step 1 :-  12 + 2 = 14

        Step 2 :-   2^2 = 4........put the result next to the result obtained in step 1)
        so ans is 144.

                   
        We get,(12)^2 = 144

     2)  (16)^2

        Step 1 :- 16 + 6 = 22

        Step 2 :- 6^2 = 36 ........put the result next to the result obtained in step 1)

        We get 2236.......for obtaine the result add middle 2 no.

        Step 3:- 2236

                     2 + 3= 5

                   So ans is 256

      

        We get, (16)^2 = 256

     2)  (18)^2

        Step 1 :- 18 + 8 = 26

        Step 2 :- 8^2 = 64 ........put the result next to the result obtained in step 1)

        We get 2664.......for obtaine the result add middle 2 no.

        Step 3:- 2666

                     6 + 6= 12

                             = 2124......Place 2 as it is and forward carry 1
                             =324

      

        We get, (18)^2 = 324.

   Tip :- If the result obtained in step second is 4 digits then add middle two digits & forward carry for get the result. 

 👍Best Luck 😊