Addition of 4-Digit Numbers

12345678
Across
  1. 3. 4123+1025
  2. 5. 4012+1036
  3. 7. 1233+4573
Down
  1. 1. 9713+1415
  2. 2. 1004+2014
  3. 4. 2015+2036
  4. 6. 3015+1203
  5. 8. 4317+2089