Integers and Rational Numbers

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Across
  1. 4. 80/8÷50/4
  2. 6. -45÷3
  3. 7. 8/8+9/8
  4. 9. -90/90 x 45/45
Down
  1. 1. 10-23
  2. 2. -44/9 x 9/-11
  3. 3. 31x2
  4. 5. 56-63
  5. 6. 15/30-(-10)/(-5)
  6. 8. -56+60