Louise and Maria's puzzle

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Across
  1. 2. a graph that uses bars to display data
  2. 5. A ratio comparing a number to 100
  3. 7. the littlest value
  4. 10. the estimated middle number
  5. 12. something compared to another
  6. 13. A tree-sided polygon
  7. 16. When a number is raised to a power
  8. 19. An exact location that has no size
  9. 20. The horizontal axis on a coordinate plane
Down
  1. 1. to remove value
  2. 3. The difference between the greatest and the least
  3. 4. the different version
  4. 6. the equation to show unequal numbers
  5. 8. the biggest value
  6. 9. A letter or symbol used to represent a quantity
  7. 11. to insert value
  8. 14. A ratio that compares two quantities.
  9. 15. the answer to the problem
  10. 17. To write a fraction or expression in simplest form
  11. 18. The vertical axis on a coordinate plane