This one is a relatively easy one and something that can be attempted by folks of all age groups. I picked it up on the internet from the following site: http://www.puzzles2puzzleu.com/
You have four 9’s and you may use any of the (+, -, /, *,.) as many times as you like.
As always, please send your answers to firstname.lastname@example.org and if you like the puzzle, please share it with others.
Happy number crunching!