Math Crossword Puzzle

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Across
  1. 4. Clue 9
  2. 6. Clue 3
  3. 8. Clue 2
  4. 9. Clue 8
  5. 11. Clue 4
  6. 12. Clue 1
Down
  1. 1. Clue 10
  2. 2. Clue 6
  3. 3. Clue 11
  4. 5. Clue 7
  5. 7. Clue 12
  6. 10. Clue 5