Math and ELA Puzzle

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Across
  1. 3. noun words like Charles, Lincoln Center or the Braves
  2. 7. the opposite of subtraction
  3. 9. lines lines that run side by side and never touch
  4. 10. property sharing is caring
  5. 12. the opposite of multiplication
  6. 14. length times width or the space inside an object
  7. 15. describes a noun
  8. 17. takes the place of a noun
Down
  1. 1. a person, place or thing
  2. 2. the border or space around an object
  3. 4. the opposite of addition
  4. 5. shapes with four sides
  5. 6. a shape with all sides that are equal
  6. 8. the opposite of division
  7. 11. the opposite sides of a rectangle are always
  8. 13. describes a verb
  9. 16. an action word