math!

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Across
  1. 3. result of subtracting
  2. 6. result of adding
  3. 8. a number with a point
  4. 9. distance from the center to edge of a circle
  5. 11. middle number in a set of data
  6. 12. measurement of an surface
  7. 14. Mathematical statement with an equals sign
  8. 15. most frequent number
Down
  1. 1. diagram representing data
  2. 2. formed by two intersecting lines
  3. 4. Point where a line crosses the axis
  4. 5. a guess
  5. 7. measurement of space
  6. 10. highest to lowest
  7. 13. a reference line on a chart
  8. 16. bottom number in a fraction