Mathematics is fun

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Across
  1. 3. to compare two or more numbers
  2. 4. the middle number
  3. 5. number or ratio that can be expressed as a fraction
  4. 7. a part of a whole
  5. 8. total space taken up by a flat shape
  6. 9. the most common number that appears in your set
Down
  1. 1. device that performs arithmetic operations
  2. 2. the occurrence of a random event
  3. 4. the average of data points
  4. 6. boundary of a circle