Mathematics

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Across
  1. 4. "per hundred"
  2. 6. where two lines cross
  3. 8. parts of a whole
  4. 10. relation with one input and one output
  5. 12. lines that never meet
  6. 13. set of points equidistant from center point
  7. 15. combining numbers
  8. 16. represents unknown value
Down
  1. 1. finding the difference between numbers
  2. 2. combining equal groups
  3. 3. average
  4. 5. split number into equal parts
  5. 7. math sentence
  6. 9. 3.14
  7. 11. proven statement
  8. 14. visual representation of data
  9. 15. measurement of shapes surface