mathematics crossword puzzle

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Across
  1. 4. taking an amount away from another
  2. 5. numbers preceding variables
  3. 6. a symbol that represents an unknown
  4. 8. the sharing of an amount of equal sized groups
  5. 10. direct or incline
  6. 11. the perimeter of a circle
Down
  1. 1. branch of math using variables
  2. 2. math that deals with shapes and figures
  3. 3. this answer to this operation is called product
  4. 7. the action of adding something
  5. 9. the result of subtraction