da impossible

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Across
  1. 3. the way of taking away
  2. 5. how long something takes
  3. 6. very hard way of taking away
  4. 8. splitting
  5. 9. the most simple way of math
  6. 12. a harder but simpler way of the easiest math
  7. 14. a pointed way of math
  8. 16. winged animal in Australia
Down
  1. 1. it bites hard
  2. 2. a way of calculating the Area
  3. 4. a number that is a even shape
  4. 7. can be times by other numbers
  5. 10. can nur be times by selbst
  6. 11. lower then 1?
  7. 13. a Australian animal dah
  8. 15. white shark, longest shark alive (Mr farrels favourite animal)