APOLOGIES: I made an error in the first Math Square today. This is a revised version that fixes the mistake. Sorry, folks!
The next-to-last week of the year opens with today's mentalfloss.com Brain Game, a new Monday Math Square. Good luck!
The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down.
Here is the SOLUTION.
NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the instructions to the letter, then pat yourself on the back (and feel free to share your numbers with us in the comments).