integer puzzle

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Across
  1. 3. This is two numbers the same distance from zero.
  2. 6. The line on which the integers are shown.
  3. 10. This is the distance from a number to zero.
  4. 11. Any number that ends in 1,3,5,7,9.
  5. 12. The answer to an addtion problem.
  6. 13. This is a pair of numbers that the sum is zero.
  7. 15. The opposite of multiplication.
  8. 17. A number that is not positive but not negative.
  9. 18. These are all the numbers above zero.
  10. 20. The answer to a subtraction problem.
Down
  1. 1. To ______ from negative to positive.
  2. 2. The opposite of subtraction.
  3. 4. The opposite of addition.
  4. 5. These are all of the numbers below zero.
  5. 7. The answer to a multiplication problem.
  6. 8. The answer to a division problem.
  7. 9. The opposite of division.
  8. 14. Another word for additive inverse.
  9. 16. These are all positive numbers and their opposites.
  10. 19. Any number that ends in 0,2,4,6,8.
  11. 21. If the number of negative _______ is odd then the product is negative.