Ответ:

  1. \(600-500=100\)
  2. \(430+80=510\)
  3. \(670-500=170\)
  4. \(40+90=130\)
  5. \(310-40=270\)
  6. \(360-60=300\)
  7. \(540+40=580\)
  8. \(400+300=700\)
  9. \(270+50=320\)
  10. \(430+70=500\)
  11. \(240-60=180\)
  12. \(760-80=680\)