Math Crossword Puzzle

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Across
  1. 4. Each number in the ___________ sequence is the sum of the two numbers that precede it
  2. 7. The word 'mathematics' is only included in this Shakespeare play
  3. 8. The number not represented in the roman numerals
  4. 9. The _______ of a triangle add up to 180
Down
  1. 1. 1.618 is known as the _________ and also the divine proportion
  2. 2. Father of Mathematics
  3. 3. A ______ number is a natural number greater than 1 that is not a product of two smaller natural numbers
  4. 5. The symbol for division
  5. 6. The only even prime number