Mathematical Crossword Puzzle

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Across
  1. 2. Exact square numbers are called ______ squares
  2. 5. 25, 36, and 49 are called perfect ______
  3. 8. A number multiplied by itself
  4. 9. √81 = 9 is an example of this
  5. 10. A number multiplied 3 times by itself
Down
  1. 1. Value obtained using the √ sign
  2. 3. 8, 27, and 64 are perfect ______
  3. 4. Opposite process of finding a cube
  4. 6. Subject dealing with numbers
  5. 7. Digits used in maths