The numbers 1-12

123456789
Across
  1. 1. 3+5
  2. 3. 11-7
  3. 5. 12-7
  4. 6. 7-4
  5. 7. 2+8
  6. 9. 12-5
Down
  1. 1. 7+4
  2. 2. 11-9
  3. 4. 4+5
  4. 6. 5+6
  5. 8. 8-7
  6. 9. 9-3