Math crossword puzzle

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Across
  1. 4. Addition combining to or more
  2. 5. Algebra letters representing numbers
  3. 7. number is divided
  4. 8. part of a whole
  5. 9. straight line through the center of the circle
  6. 10. used for making calculation
Down
  1. 1. branch of mathematics
  2. 2. order of operations
  3. 3. takeaway numbers
  4. 6. multiplication process of multiplying