Math Crossword Puzzle (ALL 4 OPERATIONS)

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Across
  1. 3. -748 ÷ 34=?
  2. 6. 678 + 98=?
  3. 8. -28 + -92=?
  4. 9. a x 21=189 What is a?
  5. 11. 91 - 107=?
  6. 12. -27 x -3=?
  7. 13. -12 + 72=?
  8. 14. 1037 ÷ 17=?
Down
  1. 1. y x 6=84. What is y?
  2. 2. 31 - (-13)=?
  3. 4. 6 x 6=?
  4. 5. 308 - 212=?
  5. 7. -388 ÷ -4=?
  6. 10. -13 x 4=?