Trick to Squaring a number that ends with 5

To square a number ending in a 5, try the following:

45 squared = 4 x 5 = 20 Hence the answer is 2025
75 squared = 7 x 8 = 56 Hence the answer is 5625

95 squared = 9 x 10 = 90 Hence the answer is 9025
135 squared = 13 x 14 = 182 Hence the answer is 18225

Note: Always add a 25 at the end.