math crossword puzzle

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Across
  1. 6. to determent
  2. 8. charge usually of money collected by the government from people or businesses for public use
  3. 10. to calibrate
  4. 12. two times bigger
  5. 15. add together
  6. 17. a sign
  7. 18. separate a number of objects into equal-size groups
  8. 20. to make simple
  9. 22. the branch of mathematics dealing with the properties and manipulation of numbers.
  10. 23. to measure
  11. 24. best thing in school
  12. 26. to increase or cause to increase greatly in number or quantity.
  13. 27. to learn
  14. 29. can make bigger numbers
  15. 30. to do math
Down
  1. 1. it doubles numbers
  2. 2. another word for math
  3. 3. to check
  4. 4. three times bigger
  5. 5. -
  6. 7. to measure
  7. 9. to go up in number
  8. 11. +
  9. 13. the finale product
  10. 14. what we use for math
  11. 16. to guess
  12. 19. to go to the nearest number
  13. 21. the action of mathematical calculation
  14. 25. makes smaller numbers
  15. 28. the act or process of performing mathematical operations to find a value