"Integer Crossword Challenge"

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Across
  1. 2. the result of addition
  2. 3. a whole number, not a fraction or decimal
  3. 4. neither positive nor negative
  4. 7. the result of multiplication
  5. 8. part of a whole, not an integer
  6. 9. zero in the denominator
Down
  1. 1. the result of division
  2. 5. right side of the number line
  3. 6. the result of subtraction
  4. 10. left side of a number line