mathematical crossword puzzle

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Across
  1. 3. number / A counting number.
  2. 5. / the concept of a value greater than any finite numerical value.
  3. 7. / Created by two rays and containing an endpoint in common.
  4. 9. – A group of objects, numbers, etc.
  5. 10. / The bottom symbol or number of a fraction.
  6. 13. / The space contained within a shape.
  7. 14. / The distance measured around a circle.
  8. 15. – A comparison between two numbers or symbols.
  9. 18. – A symbol that stands for a number.
Down
  1. 1. / A relationship between symbols and/or numbers that is balanced.
  2. 2. / A line segment that connects two points on a circle.
  3. 4. – The four divisions on a coordinate graph.
  4. 6. / proportion or rate per hundred parts.
  5. 7. / a section of a curve, graph, or geometric figure
  6. 8. / The middle item in an ordered group.
  7. 11. number / A number that can be divided by only itself and one.
  8. 12. / To divide into two equal sections.
  9. 14. / a symbol representing an unspecified number that remains invariable throughout a particular series of operations
  10. 16. / nought.
  11. 17. – A literal or numerical expression that has its own sign.