Addition (small and easy)

123456
Across
  1. 3. 250000+7500000
  2. 4. 559+109
  3. 5. 790+30
  4. 6. 422+483
Down
  1. 1. 48+52
  2. 2. 4080+90
  3. 3. 189000+907+80
  4. 4. 700+80+9