Math crossword puzzle

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Across
  1. 2. repeats
  2. 5. letter in a equation
  3. 8. little number on top
  4. 9. the horizontal line
  5. 14. something you need to do math
  6. 15. bottom number of the fraction
  7. 16. a number multiplying
  8. 18. a part of something
  9. 19. shapes
  10. 20. fast walking
Down
  1. 1. the vertical line
  2. 3. used as a building block
  3. 4. type of plot
  4. 6. there is no whole number
  5. 7. the m in y=mx+b
  6. 10. inside
  7. 11. points in a triangle
  8. 12. what you know
  9. 13. top number of the fraction
  10. 17. the same number