Adding and Subtracting Integers

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Across
  1. 2. -21 + 39 = what?
  2. 5. True or false: Temperatures that fall below zero, like in Alaska, are negative integers
  3. 7. True or false: -6 + 6 = 0
  4. 10. -8 + 1 = what? (2 words)
  5. 12. the opposite of -4
  6. 14. The answer to a subtraction problem
  7. 15. True or false: 0 is a negative integer
Down
  1. 1. Positive and negative numbers are called what?
  2. 3. Integers to the left of 0 on a number line
  3. 4. Integers to the right of 0 on a number line
  4. 6. -8 + 2 = what? (2 words)
  5. 8. 2 integers that are the same distance from 0 are called...
  6. 9. the opposite of 1
  7. 11. The answer to an addition problem
  8. 13. 5 + -4 = what?