Math crosswords

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Across
  1. 2. 50% of a number
  2. 4. unknown number
  3. 6. used in the metric system to weigh
  4. 8. term a fraction in it's simplest form
  5. 12. an equation that is not equal on both sides
  6. 13. a number that can be negative or positive
  7. 14. the answer to a division problem
  8. 15. to the power of three
  9. 16. inside of a shape
  10. 17. 1000 meters
  11. 19. an angle smaller than 90 degrees
  12. 20. triangle a triangle with no equal sides
Down
  1. 1. The rate at which something changes
  2. 3. the center of a graph(0,0)
  3. 5. half of a circle
  4. 7. how much a figure can hold inside
  5. 9. an equation that is equal on both sides
  6. 10. The perimeter of a circle
  7. 11. circle from one side to another
  8. 18. angle an angle bigger than 90 degrees