Math crossword puzzle

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Across
  1. 5. parallel to the plane of the horizon
  2. 6. Make the number of a value go up
  3. 10. The bottom of a fraction
  4. 12. the extent or measurement of a surface
  5. 13. A percent of a value
  6. 15. way to say the solution to adding two values
  7. 16. A way to find the solution
  8. 17. multiply the value
  9. 19. 90 degree angle
  10. 20. the value
Down
  1. 1. three dimensional with parallel circular bases
  2. 2. Something repeats
  3. 3. to see how long the width or hight is
  4. 4. the amount of space that a object uses
  5. 7. Make the number of a value go down
  6. 8. A angle more than 90° and less than 180
  7. 9. 4 sided shape
  8. 11. set value into groups
  9. 14. The top of a fraction
  10. 18. A angle less then 90 degrees