mathematical terms

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Across
  1. 3. making a number however many times bigger
  2. 4. it is putting together two or more numbers
  3. 9. the amount of space inside a shape
  4. 11. taking 1 number away from another number
  5. 13. the study of triangles
  6. 17. ________ is the mathematical study of continuous change
  7. 18. a deductive argument for a mathematical statement, showing that the stated assumptions
  8. 21. less than 0
  9. 22. it is the same as
  10. 23. where you make a graph
Down
  1. 1. the length around a polygon
  2. 2. more than 0
  3. 5. a different way of writing a fraction
  4. 6. math were you solve for an unknown variable
  5. 7. multiplying a number by itself multiple times
  6. 8. the length halfway to the middle of the circle
  7. 10. it is like saying, "how many times does this number go into another number?"
  8. 12. it starts with 3.14159 and never ends
  9. 14. plotting data
  10. 15. a number sentence
  11. 16. the length around a circle
  12. 19. a letter that represents a number
  13. 20. 1/2 and 3/4 are examples of a _____