maths

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Across
  1. 2. 87+56
  2. 5. formula used to measure circumference of a circle
  3. 6. the data value that appears the most
  4. 8. largest number minus smallest number
  5. 9. sum of -5 and -6
  6. 10. what does the square root of 144 equal
  7. 12. the only number to have its letters in alphabetical order
  8. 14. what number doesn't have its own roman numeral
Down
  1. 1. the set of numbers containing whole numbers and their opposites
  2. 2. formula for a triangle area
  3. 3. what is X if X+2y=10 and Y=3
  4. 4. the middle value of a data
  5. 7. the average of a data set
  6. 11. the only number that has the same number of letters as its meaning
  7. 13. are the opposite angles of a parallelogram equal