Maths Mixed Bag

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Across
  1. 4. a device used for mathematical calculations
  2. 5. sides in a polygon with each 120° interior angle
  3. 6. Dividing by zero gives
  4. 7. A number having the power of 0
  5. 9. 1 + omega + omega square are cube roots of?
Down
  1. 1. The mathematician who said that world is number
  2. 2. ARRANGEMENT OR REARRANGEMENT
  3. 3. 121 is a _____ number
  4. 8. the third square number
  5. 10. THE ONLY EVEN PRIME NUMBER