Add Subtract Fractions

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Across
  1. 4. 15/15 - 5/15 =
  2. 7. 8/15 + 4/15 =
  3. 9. 18/30 - 10/30 =
  4. 10. 3/7 - 1/7 =
  5. 11. 3/9 + 1/9 =
Down
  1. 1. 8/15 + 2/15 =
  2. 2. 2/10 + 6/10 =
  3. 3. 2/12 + 6/12 =
  4. 5. 3/7 + 2/7 =
  5. 6. 2/8 + 1/8 =
  6. 8. 5/9 - 4/9 =