1) Adding a nine***/*****
22 = 4. Writing a 9 after it, I get 49 which is 72
42 = 16. Writing a 9 after it, I get 169 which is 132
What is the next square number, which, when adding a 9 after the number, is a square?
You can check your solution here
New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.
justpuzzles 