numbers

12345678
Across
  1. 1. one + five =?
  2. 3. eight + one =?
  3. 4. one + three =?
  4. 5. two + eight =?
  5. 6. nine-eight=?
  6. 7. one + seven =?
Down
  1. 1. ten - three =?
  2. 2. eight - eight =?
  3. 4. nine - four =?
  4. 5. seven - four =?
  5. 8. one + one =?