Math Crossword Puzzle

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Across
  1. 9. Adding 2 or more numbers
  2. 10. What a number is worth
  3. 11. Anything lower than zero
  4. 14. Combining numbers together
  5. 16. represents the number of parts out of
  6. 17. To break up a number
  7. 18. Whole amount
  8. 19. Ratio that compares two different
  9. 20. Result of one or more multiplications
  10. 21. Adding to a number
Down
  1. 1. represent the parts of a whole
  2. 2. combination
  3. 3. a figure representing the total population
  4. 4. Taking away
  5. 5. Anything greater than zero
  6. 6. shows the relative sizes of two or more
  7. 7. A number or variable and any
  8. 8. Smaller in size
  9. 12. Horizontal measurement
  10. 13. Equal on both sides
  11. 15. Can be expressed as a fraction of 100.