bi- tri- and multi-

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Across
  1. 2. More than one of something
  2. 4. A series of 3 books
  3. 6. A stand with 3 legs
  4. 7. A mathematical term that means "groups of"
  5. 8. A vehicle with 2 wheels
Down
  1. 1. A person who speaks 2 languages
  2. 3. 3 babies that were born at once
  3. 4. Something with exactly 3 colors
  4. 5. A vehicle with 3 wheels
  5. 7. Doing multiple things at once