Mathematics Terms I

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Across
  1. 1. the number set 1, 2, 3, 4, etc.
  2. 6. another term for addition
  3. 8. a set of numbers greater than zero
  4. 9. the total of the numbers combined in addition
  5. 11. another term for addition
  6. 12. another term for subtraction
  7. 13. the numbers combined in subtraction
Down
  1. 2. the numbers combined in addition
  2. 3. the total of the numbers combined in subtraction
  3. 4. a set of numbers less than zero
  4. 5. the number set ...-2, -1, 0, 1, 2...
  5. 7. the number set 0, 1, 2, 3, etc.
  6. 10. another term for subtraction