Fractions

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Across
  1. 2. 7/8-2/4
  2. 4. 9/9-7/9
  3. 6. 1/4+1/3
  4. 8. 4/6-2/12
  5. 11. 9/20+2/5
  6. 13. 3/7+4/7
Down
  1. 1. 6/9-1/3
  2. 3. 2/3+1/5
  3. 5. 2/8+3/10
  4. 7. 4/10+2/5
  5. 9. 1/3+1/2
  6. 10. 2/3-1/4
  7. 12. 8/10-5/10