Square roots

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