number system

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Across
  1. 2. a number multiplied by itself
  2. 4. a number which is 3 times multiplied by its original number
  3. 6. can't be expressed as ratio of integers
  4. 8. can be in the form of p/q
  5. 9. the raising a base number to the exponent
Down
  1. 1. they never be negative
  2. 3. has an end
  3. 5. breaking or decomposition
  4. 7. a number that when multiplied by it self products the original number