Square roots

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