integers

123456789
Across
  1. 2. set of numbers closed under an operation
  2. 3. a positive whole number
  3. 5. opposite number of that number
  4. 9. a number added to zero
Down
  1. 1. if position of integer is changed
  2. 4. when change of bracket takes place
  3. 6. a number after zero
  4. 7. a number without fractions
  5. 8. a number before zero