The mentalfloss.com Brain Game offers a new entry in our longest-running weekly feature: the Monday Math Square. Enjoy!

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.

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Here is the solution: