Math crossword puzzle

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Across
  1. 2. a polygon with 8 sides
  2. 4. strategy jumping along an empty number line using place value to work out a calculation
  3. 5. one part of one hundred divided into 100 parts
  4. 9. section of a circle, bounded by two radii and an arc
  5. 10. a positive number, a negative number or zerobut not a fraction or a decimal fraction
  6. 12. mathematical information organised in columns and rows
  7. 14. equidistant, that is,the same distance apart, never touching
  8. 15. To make an approximate calculation
  9. 18. a polygon with four angles and four sides
  10. 20. The smallest value or amount
Down
  1. 1. a visual diagram used to represent statistical informationor functions and equations.
  2. 3. The distance around a circle
  3. 6. a flat shape which can be folded up into a three-dimensional solid
  4. 7. A line passing through the center of a circle
  5. 8. a measurement unit of digital information,with two different values
  6. 11. the angle made at the centre of a circle by an arc equal
  7. 13. any part of a group, number or whole
  8. 16. The bottom of something
  9. 17. the quantity of matter in an object
  10. 19. The highest point