Question

find the number from 100 to 400 that end with 0,1,4,5,6,or,9 which are the perfect square

Answer 1

First let me tell you perfect square always end with these digits 0,1,4,5,6 or 9.
Now, As 100 =(10)^2 and 400= (20)^2
That means , All the squares of 11 to 19 will be the answer which are 121,169,196,225,256,289,324 and 361.