Math Crossword Puzzle

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Across
  1. 2. the measurement of the inside of a shape
  2. 3. the middle number in a set of data
  3. 5. a number multiplied by itself a set number of times
  4. 7. comparison of two quantities
  5. 10. the result of subtracting numbers
  6. 12. a four sided shape
  7. 15. a point on a graph
  8. 17. the result of dividing numbers
  9. 18. synonym for 'equal'
Down
  1. 1. the result of multiplying numbers
  2. 3. the number that appears most often in a set of data
  3. 4. the average number in a set of data
  4. 6. the measurement around a shape
  5. 8. a mathematical sentence with no equal sign
  6. 9. the order of operations
  7. 11. a mathematical sentence stating two things are equal
  8. 13. a three sided shape
  9. 14. 'counting numbers'
  10. 16. the result of adding numbers