ADDITION

12345678
Across
  1. 2. 284+137+426
  2. 5. 510+200+80
  3. 6. 205+312+141
  4. 8. 342+126+258
Down
  1. 1. 699+201
  2. 2. 456+385
  3. 3. 582+174
  4. 4. 425+153
  5. 7. 367+215
  6. 8. 175+215+320