The numbers

12345678910
Across
  1. 3. 69+28
  2. 4. 97-63
  3. 7. 45-12
  4. 8. 76-47
  5. 9. 51+24
Down
  1. 1. 87+9
  2. 2. 36+8
  3. 5. 64-51
  4. 6. 12+46
  5. 10. 67-41