Math-word puzzle

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Across
  1. 5. The largest number - the smallest
  2. 6. A way to simplify expressions
  3. 10. the highest number
  4. 11. A small amount of a number
  5. 14. A graphic used to organize numbers
  6. 16. Example 3 + 2 = 2 + 3
  7. 19. An answer to a division problem
  8. 20. Example 3 + (2 - x)
Down
  1. 1. Example 3^2
  2. 2. An answer to a subtraction problem
  3. 3. where mean is not able to be found
  4. 4. A number next to a variable
  5. 7. pi
  6. 8. Example 3(2 + 2)
  7. 9. an independent value
  8. 12. A math problem without an equals sign
  9. 13. Smaller than 1
  10. 15. In Between a mean and an extreme
  11. 17. An answer to an addition problem
  12. 18. An answer to multiplication problem