Adding -tion and -sion

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Across
  1. 2. opposite of multiplication caution Watch out!
  2. 5. being confused multiplication opposite of division
  3. 6. moving
  4. 9. watch out
  5. 10. when two cars crash into each other
Down
  1. 1. opposite of division
  2. 3. being able to see with your eyes
  3. 4. the opposite of subtraction transportation when something is moving
  4. 7. opposite of addition collision when two cars crash into each other
  5. 8. large house