mathematics

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Across
  1. 3. upper limit and lower limit
  2. 8. method to make mathematical concepts
  3. 10. have 10 sides
  4. 11. System of numbering based on powers of 10 (6 letters)
  5. 12. another name of irrational number
  6. 13. a alphabet in mathematics language
Down
  1. 1. Measurement tool for weight or musical notes (5 letters)
  2. 2. half of something
  3. 4. have 8 sides
  4. 5. a way to write decimal
  5. 6. half of diameter
  6. 7. starts from F and are numbers of numbers
  7. 9. mathematical drawing