Multiplication Techniques: Part 2

Multiplying a two-digit number by itself starting with 5.

Sample: 54 x 54 = ?

First, multiply the last digit: 4 x 4 = 16. This will be the last two digits of the answer.

Second, multiply the other digit by itself: 5x5 = 25

Now add the last digit to the product in Step 2. This will give you ->

25 + 4 = 29. This will be the first two-digits of the answer!

Presto! The answer is 2916. Got it?

Another example: 59 x 59? Did you see how did you arrive at 3,481?