Squaring numbers in 41 - 49

Take 46:

The steps would be:

1. Take 15.(this is not the square of 4, but it is one less than 5 so take 15(this is not the actual reason, however please remember like that)). Now add the that 6 to 15, you get 21.
2. Now square the difference between 50 and 46 and attach to 21. Difference is 4, square of 4 is 16.
3. So on attaching, the answer is 2116.

Now try all the numbers from 41 - 49 and practice this method.