Integers Crossword Puzzle

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Across
  1. 3. - the way in which numbers are grouped does not change their sum/product
  2. 4. - one positive counter paired with one negative counter
  3. 9. - integers that are less than zero & written with a - sign
  4. 10. - the sum of an addend and zero is the addend
  5. 12. value - a number's distance from zero on a number line
  6. 13. -11 + 18 =
Down
  1. 1. - two integers that are opposites
  2. 2. - write an expression in simplest form
  3. 3. - the sum of any number and zero is the number
  4. 5. - the multiplicative inverse of a number
  5. 6. - integers greater than zero & written with a + sign
  6. 7. any number from the set { -4, -3, 0, 1, 2, 3}
  7. 8. - Integers like 2 and -2 are
  8. 11. - property that states the order in which numbers are added/multiplied does not change the sum/product