Uni,Bi,Tri,Other

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Across
  1. 3. A two wheeled vehicle
  2. 4. When you multiply something by four
  3. 5. An animal with eight tentacles
  4. 7. Three teeth
  5. 9. The tenth month in a year
  6. 10. Together or at the same time
Down
  1. 1. A dinosaur with three horns
  2. 2. A four sided shape
  3. 6. A thing that can help you see someone far away
  4. 7. A number with nine zeros
  5. 8. A magical one-horned creature