Math Crossword Fun!

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Across
  1. 1. I am round
  2. 3. I am divided by two by the diameter
  3. 5. I show data
  4. 6. I am not a square
  5. 9. I am an exact number
  6. 10. I am twice the radius
  7. 11. I am split into parts
  8. 14. I am a number multiplied by a variable
  9. 15. I am part of 100%
  10. 17. I am a math action artist, such as,+,-,x,division
  11. 18. I have numbers on my long line
  12. 19. I am a rectangle
Down
  1. 2. I am a fixed value that does not change
  2. 4. To solve a complicated problem you use me to solve
  3. 7. Expression I am a mathematical phrase combining numbers, letters
  4. 8. I am a letter that represents an unknown number
  5. 12. I fill in a shape
  6. 13. I surround a shape
  7. 16. I am an expression separated by + or - signs