Math Crossword Puzzle

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Across
  1. 2. Inverse of multiplication
  2. 5. Three-sided shape
  3. 8. Inverse of division
  4. 9. Deals with relationships of sides of triangles
  5. 10. Uses symbols in place of numbers
Down
  1. 1. Eight-sided shape
  2. 3. Inverse of addition
  3. 4. Four-sided shape
  4. 6. Inverse of subtraction
  5. 7. Has to do with points and shapes