Squares of numbers - 1

We will deal with the simple case of squaring a number which ends in 5 ,i.e the digit in the unit's place is 5.

"One more than before".

Let us take an example. Consider 35*35,

Step 1 Square the unit's place digit ,i.e 5*5 = 25. So, 25 will be the last two digits of our answer.

Step 2 multiply 3 with 4 ( one more than before). So, the result is 12.

So, our final answer = 1225.

Let us take one be more example. Consider, 125*125,

Step 1 Square the unit's place digit. So, 25 (5*5) will always be our last 2 digits of the final answer.

Step 2 Multiply 12 with 13 ( since, 13 is one more than 12). The result is 156.

So, our final answer = 15625.

We will be discussing more general methods of squaring in the later posts.