Math crossword problems

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Across
  1. 4. it has both magnitude and direction
  2. 5. A straight line passing through the centre of a circle
  3. 7. the intersection of the x and y axis
  4. 9. A tax that is added to a price of particular goods and services
  5. 11. Is a fraction expressed as a number out of 100 followed by the % symbol
  6. 12. Height of an object above a given level
  7. 13. get a smaller size, number or quantity
  8. 15. A mathematical operation needs to be done in right order
  9. 17. A number in a number system based on 10
  10. 18. A absolute value of a number
  11. 19. a positive number, a negative number or zero
  12. 20. Interest in a amount of money a lender charges a borrower
Down
  1. 1. the distance around a circle
  2. 2. Parallel to the horizon
  3. 3. the distance from centre of a circle to its circumference
  4. 6. terms A term that contains only a number
  5. 8. get a larger size, number or quantity
  6. 10. A expression with variables and constant
  7. 14. A ratio between two sets of measurements
  8. 16. the total space of a shape, surface, and object