Square a 2 Digit Number Ending with 5
Here is an interesting trick for square.
For this example, we will use 25
Take the "tens" part of the number (the 2 and add 1) = 3
Multiply the original "tens" part of the number by the new number (2x3)
Take the result (2x3=6) and put 25 behind it.
Result in the answer 625.
Try a few more 75 squared ... = 7x8=56 ... put 25 behind it is 5625.
55 squared = 5x6=30 ... put 25 behind it ... is 3025.
Another easy one! Practice it on paper first!