Hayden's Math Puzzle

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Across
  1. 3. short of a rectangle
  2. 5. units volume is measured in
  3. 7. temperature going down
  4. 8. amount of space inside a flat figure
  5. 10. a letter or symbol
  6. 12. the distance formula
  7. 13. long side of a rectangle
  8. 14. numbers that are multiplied
  9. 16. the branch of mathematics
Down
  1. 1. terms that have different variables
  2. 2. units area is measured in
  3. 4. rounding up money
  4. 5. the number the multiples the variable
  5. 6. something of a higher number
  6. 9. the sides across from eachother
  7. 11. Another word for borrowing
  8. 15. the answer to an addition problem