Math crossword puzzle

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Across
  1. 3. numbers
  2. 6. line through the center of the circle
  3. 7. of a whole
  4. 9. of operations
Down
  1. 1. - letters representing numbers
  2. 2. for making calculation
  3. 4. of multiplying
  4. 5. is divided
  5. 8. - combining to or more