Maths Crossword Puzzle

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Across
  1. 4. (-5)-(-13)= ____.
  2. 6. A ___________ is a fraction where the numerator and the denominator are reversed.
  3. 9. product of 2 negative integers is always _________.
  4. 10. Zero is greater than _________ numbers.
Down
  1. 1. Which property under addition is a+b = b+a.
  2. 2. 15 multiply by 3/5.
  3. 3. Which property under subtraction is (a-b)-c is not equal to a-(b-c).
  4. 5. In _________ fractions the numerator is bigger than the denominator.
  5. 7. 5/2 mutiply by 6 = ______.
  6. 8. Is an additive identity for integers.