Brain Game: Math Square #91

Get your grey matter in shape for the week with today's mentalfloss.com Brain Game, a brand 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.