integers crossword

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123456789101112
Across
  1. 3. the operation used to find the sum of integers
  2. 6. (-20)\ (-4)
  3. 8. for any two integers a and b, a+b is an ______
  4. 10. the operation used to find the difference between two integers
  5. 11. this integer has no sign
  6. 12. product of two negative integers is _____
Down
  1. 1. the operation used to find the product of integer
  2. 2. (-20)x (-5)
  3. 4. the symbol used before a negative integer
  4. 5. multiplying of a negative integer to a positive integer gives ______
  5. 7. the operation used to find quotient of integer
  6. 9. integer ___ is the identity under multiplication