Square roots

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Across
  1. 1. part of a whole thing or a group of things
  2. 6. square that can be expressed as the product of two equal integers.
  3. 7. lower part of a fraction
  4. 8. number under the radical sign
  5. 10. set of numbers denoted with Z
  6. 12. the set {1, 2, 3,...) that is used for couning
Down
  1. 2. set of numbers represented with fractions
  2. 3. part of the decimal number to the left of decimal point
  3. 4. upper part of a fraction
  4. 5. root sign
  5. 6. non-negative square root of a number
  6. 7. symbols that used to represent a number
  7. 9. fraction whose denominator is power of 10
  8. 11. a collection of well-defined objects
  9. 13. square ..... of a number A is such a number whose square is A