Ответ:

  1. \(2\,000 + 1\,000 = 3\,000\).
  2. \(10 + 100 = 110\).
  3. \(6\,300 - 1\,000 = 5\,300\).
  4. \(850 + 1\,000 = 1\,850\).
  5. \(208\,000 - 200\,000 = 8\,000\).
  6. \(60\,990 - 90 = 60\,900\).

Ответ: 3 000; 110; 5 300; 1 850; 8 000; 60 900.