Number system

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Across
  1. 3. a number multiplied by itself to give another number.
  2. 6. inverse of a number, product is 1.
  3. 11. product of a number and integer.
  4. 12. a number that can not be expressed as a fraction.
  5. 15. a number has more than two factors.
  6. 16. a number has two factors: 1 and itself.
  7. 17. counting number starts from 1.
  8. 19. a decimal that continues forever.
  9. 20. a number divisible by 2.
Down
  1. 1. a number that divides another number exactly.
  2. 2. natural numbers including zero.
  3. 4. represents a part of whole.
  4. 5. a number that can be expressed as ratio of two integer.
  5. 7. a number which gives original when cubed.
  6. 8. a number do not divisible by 2.
  7. 9. a whole number can be positive,negative or zero.
  8. 10. a decimal that ends after few digits.
  9. 13. distance from zero on a number line.
  10. 14. set including both rational and irrational.
  11. 18. irrational root that can not be simplified.