Example  1 : 54*54 = 2916

Step 1 : Square the first digit of 54 (i.e. 5) and add the second digit to it (i.e. 4), so here  (5*5) + 4 = 29

Step 2 : Square the second digit in 54 (i.e. 4), so here 4*4 = 16

Step 3 : Append the result of Step 1 & Step 2. 2916 (It’s the final answer)