Number Game

12345678
Across
  1. 2. 5+5=?
  2. 5. 10+3=?
  3. 6. 10-9=?
  4. 8. 10-7=?
Down
  1. 1. 4+3=?
  2. 3. 7-2=?
  3. 4. 7-7=?
  4. 5. before Three?
  5. 7. After Eigtht?