Math Crossword Puzzle

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Across
  1. 1. an expression made of variables, constants, and exponents
  2. 4. Parts of numbers
  3. 7. A U-shaped curve
  4. 8. un-multiplying of numbers
  5. 10. The main thing in math
  6. 11. What was learned in 7th-grade gem
  7. 13. The distance around a circle
  8. 16. A value that doesn't change
  9. 18. The distance across a circle through the center
  10. 19. A polynomial with two terms
  11. 20. Two expressions grouped together that are equal
Down
  1. 2. Adding of numbers
  2. 3. A letter that represents a value
  3. 5. Un-adding of numbers
  4. 6. The ratio of the circumference of a circle to its diameter
  5. 9. Someone that does math
  6. 12. A polynomial with three terms
  7. 14. Multiplying of numbers
  8. 15. The thing that raises numbers to a power
  9. 17. Multiple terms grouped together