Ответ:

  1. 70000 + 600 = 70600.

  2. 38000 − 30000 = 8000.

  3. 64500 − 500 = 64000.

  4. 726000 − 20000 = 706000.

  5. 20000 + 800 + 6 = 20806.

  6. 3000000 + 10000 + 400 = 3010400.