It’s been a while since I’ve thrown a Mental Floss Brain Game up here. Monday morning seems like a good time for one. It’ll help jump start your brain after a nice weekend of football:

The nine squares that make up the main grid should be filled with the digits 1 through 9. Two of these (2 and 7) are already provided for you. Place the other digits in the correct spots so that the mathematical equations work both across and down. (Remember your algebraic rules when solving the problems… multiplication and division should be solved first, then addition and subtraction.) Good luck!

For the sake of generating interest in the puzzle, I timed myself. It took me 56 seconds to figure it out, but there was definitely room for improvement. Let’s see if you can do better.

When you’re done, or you give up, you can check out the solution here.