Go Figure! from Windows Entertainment Pack 4

The following are the rules, copied from Help - How to Play - Overview:

Go Figure! was created with one delicious goal in mind: to entice people into the enjoyable world of numbers. Messing around with math is way too much fun to be restricted to schools. Go Figure! is a celebration of the math side of your brain! And the math side is a fun side of the brain to put into gear. Your brain will be more than happy to rise to the occasion of solving these equation puzzles. Blame it on pocket calculators and computers, but most brains just don't get to play enough with numbers!

Speaking of playing with numbers, there's another reason to go head-over-heels for Go Figure! It's a great self-improvement tool. Sharpening your math skills is something that comes effortlessly when you dive into this game. And it sharpens your math skills in a hurry.

Go Figure! provides you with four numbers, four operator signs, and the answer. Your job is to place the four numbers and whatever operators you care to use into the correct order to match the answer. If you get stuck, just click the Hint button and the computer fills in a number and an operator sign. Click again, and you are half way there.

Go Figure!